ReferenceID PublicationType Full Reference PrimaryTitle SecondaryTitle Pages PageStart PageEnd Volume Edition Publisher AuthorList EditorList DateCreated Language URL DOI LocalityOfPublisher Ref_2 Mead, A. D., 1894. Preliminary account of the cell lineage of Amphitrite and other annelids. J. Morph., 9: 465-473. Ref_3 Mead, A. D., 1897. The early development of marine annelids. J. Morph., 13: 227-326. Ref_4 Mead, A. D., 1899. The cell origin of the prototroch. Biol. Lectures M. B. L., Wood's Holl, Mass., 1898, pp. 113-138. Ref_5 Scott, J. W., 1906. Morphology of the parthenogenetic development of Amphitrite. J. Exp. Zool., 3: 49-97. Ref_6 Scott, J. W., 1909. Some egg-laying habits of Amphitrite ornata Verrill. Biol. Bull., 17: 327-340. Ref_7 Scott, J. W., 1911. Further experiments on the methods of egg-laying in Amphitrite. Biol. Bull., 20: 252-265. Ref_8 Treadwell, A. L., 1898. The cell lineage of Podarke obscura. Preliminary communication. Zool. Bull., 1: 195-203. Ref_9 Treadwell, A. L., 1899. Equal and unequal cleavage in annelids. Biol. Lectures M. B. L., Wood's Holl, Mass., 1898, pp. 93-111. Ref_10 Berrill, N. J., 1935. Studies in tunicate development. Iv. Asexual reproduction. Phil. Trans. Roy. Soc., London, ser. B, 225: 327-379. Ref_11 Brien P. 1930. Contribution á l'etude de la regeneration naturelle et experimentale chez les Ciaveiinidae. Ann. Soc. Roy. Zool. Belg., 61: 19-112. Ref_12 Grave, C., 1920. Amaroucium pellucidum (Leidy) form constellatum (Verrill). I. The activities and reactions of the tadpole larva. J. Exp. Zool., 30: 239-257. Ref_13 Grave, C., 1921. Amaroucium constellatum (Verrill). Ii. The structure and organization of the tadpole larva. J. Morph., 36: 71-91. Ref_14 Grave, C., 1935. Metamorphosis of ascidian larvae. Pap. Tortugas Lab., 29: 209-291. (Carnegie Inst., Wash., Publ. no. 452.). Ref_16 Korschelt, E., 1936. Vergleichende Entwicklungsgeschichte der Tiere, vol. 2. Jena. Ref_17 Lynch, W. F., 1956. Factors inhibiting metamorphosis in tadpoles of the tunicate Amaroecium constellatum. Biol. Bull., 111: 308. Ref_18 Mast, S. O., 1921. Reactions to light in the larvae of the ascidians, Amaroucium constellatum and Amaroucium pellucidum with special reference to photic orientation. J. Exp. Zool., 34: 149-187. Ref_19 Scott, Sister Florence Marie, 1934. Studies on the later embryonic development of Tunicata: Botryllus schlosseri and Amaroecium constellatum. Ph.D. Dissertation, Columbia Univ., pp. 1-53. Ref_20 Scott, Sister Florence Marie, 1945. The developmental history of Amaroecium constellatum. I. Early embryonic development. Biol. Bull. 88: 126-138. Ref_21 Scott, Sister Florence Marie, 1946. The developmental history of Amaroecium constellatum. Ii. Organogenesis of the larval action system. Biol. Bull., 91: 66-80. Ref_22 Scott, Sister Florence Marie, 1952. The developmental history of Amaroecium constellatum. Iii. Metamorphosis. Biol. Bull., 103: 226-241. Ref_23 Ball, E. G. 1936. Echinochrome, its isolation and composition. J. Biol. Chem., 114: vi. Ref_24 Boolootian R. A., and A. R. Moore, 1956. Hermaphroditism in echinoids. Biol. Bull., 111: 328-335. Ref_25 Cohn, E. J., 1918. Studies in the physiology of spermatozoa. Biol. Bull., 34: 167-218. Ref_26 Dan, K., 1954. The cortical movement in Arbacia punctulata eggs through cleavage cycles. Embryologia, 2: 115-122. Ref_27 Fry, H. J., 1936. Studies of the mitotic figure. V. The time schedule of mitotic changes in developing Arbacia eggs. Biol. Bull., 70: 89-99. Ref_28 Hartmann M., O. Schartau, R. Kuhn and K. Wallenfels 1939. Über die Sexualstoffe der Seeigel. Naturwiss., 27: 433. Ref_29 Harvey, E. B., 1939. A method of determining the sex of Arbacia, and a new method of producing twins, triplets and quadruplets. Coll. Net, 14: 211. Ref_31 Harvey, E. B., 1953. A simplified electrical method of determining the sex of sea urchins and other marine animals. Biol. Bull., 105: 365. Ref_32 Harvey, E. B., 1956a. The American Arbacia and Other Sea Urchins. Princeton University Press, Princeton, N. J. Ref_33 Harvey, E. B., 1956b. Sex in sea urchins. Pubbl. Stas. Zool., Napoli, 28: 127-135. Ref_34 Harvey, E. B., and T. F. Anderson,, 1943. The spermatozoon and fertilization membrane of Arbacia punctulata as shown by the electron microscope. Biol. Bull., 85: 151-156. Ref_35 Hayashi, T., 1945. Dilution medium and survival of the spermatozoa of Arbacia punctulata. I. Effect of the medium on fertilizing power. Biol. Bull., 89: 162-179. Ref_36 Hoadley, L., 1934. The relation between the position of the female pronucleus and the polar bodies in the unfertilized egg of Arbacia punctulata. Biol. Bull., 67: 220-222. Ref_37 Hörstadius, S., 1939. The mechanics of sea urchin development, studied by operative methods. Biol. Rev., 14: 132-179. Ref_38 Iwata, K. S., 1950. A method of determining the sex of sea urchins and of obtaining eggs by electric stimulation. Annot. Zool. Jap., 23: 39-42. Ref_39 Just, E. E., 1939. Basic Methods for Experiments on Eggs of Marine Animals. P. Blakiston's Son & Co., Inc., Philadelphia. Ref_40 Lillie, F. R., 1915. Studies of fertilization. Vii. Analysis of variations in the fertilizing power of sperm suspensions of Arbacia. Biol. Bull., 28: 229-251. Ref_41 Marx, W., 1932. Zum Problem der Determination der Bilateralität im Seeigelkeim. (Nebst einem Beitrag zur Kenntnis des Geschlechtsdimorphismus einiger Seeigel.) Arch. f. Entw., 125: 96-147. Ref_42 Moser, F., 1939. Studies on a cortical layer response to stimulating agents m the Arbacia egg. Parts I and Ii. J. Exp. Zool., 80: 423-471. Ref_43 Moser, F., 1940. Studies on a cortical layer response to stimulating agents in the Arbacia egg. Parts Iii and Iv. Biol. Bull., 78: 68-91. Ref_44 Ohman, L. -O., 1945. On the lipids of the sea-urchin egg. Arch. f. Zoologi, 36A: no. 7, 1-95. Palmer, L., 1937. The shedding reaction in Arbacia punctulata. Physiol. Zool., 10: 352-367. Ref_45 Runnström J., 1928. Die Veranderung der Plasmakolloide bei der Entwicklungserregung des Seeigeleis. Protoplasma, 4: 388-514. Ref_46 Runnström, J., L. MonnÉ and E. Wicklund, 1944. Mechanisms of formation of the fertilization membrane in the sea urchin egg. Nature, 153: 313-314. Ref_47 Tyler, A., 1939. Crystalline echinochrome and spinochrome: Their failure to stimulate the respiration of eggs and of sperm of Strongylocentrotus. Proc. Nat. Acad. Sci., 25: 523528. Ref_48 Tyler, A., 1949. A simple non-injurious method for inducing repeated spawning of sea urchins and sand-dollars. Coll. Net, 19: 19-20. Ref_49 Zeuthen, E., 1955. Mitotic respiratory rhythms in single eggs of Psammechinus miliaris and of Ciona intestinalis., Biol. Bull., 105: 366-385. Ref_50 Bumpus, H. C., 1898. The breeding of animals at Woods Holl during the months of June, July and August. Science, 8: 850-858. Ref_51 Child, C. M., 1897. A preliminary account of the cleavage of Arenicola cristata, with remarks on the mosaic theory. Zool. Bull., 1: 71-94. Ref_52 Child, C. M., 1898. The maturation and fertilization of the egg of Arenicola marina. Trans. N. Y. Acad. Sci., 16: 387-394. Ref_53 Child, C. M., 1900. The early development of Arenicola and Sternaspis. Arch. f. Entw., 9: 587-723. Ref_54 Downing, E. R., 1911. The formation of the spermatophore in Arenicola and a theory of the alternation of generations in animals. J. Morph., 22: 1001-1051. Ref_55 Newell, G. E., 1948. A contribution to our knowledge of the life history of Arenicola marina L. J. Mar. Biol. Assoc., 27: 554-580. Ref_56 Okada, K., 1941. The gametogenesis, the breeding habits, and the early development of Arenicola cristata Stimpson, a tubicolous polychaete. Sci. Rep. Tohoku Imp. Univ., ser. 4, Biol., 16: 99-146. Ref_57 Okuda, S., 1938. Notes on the spawning habit of Arenicola claparedii Levinsen. Annot. Zool. Japon., 17: 577-580. Ref_60 Drew, G. A., 1901. The life-history of Nucula delphinodonta (Mighels). Quart. J. Micr. Sci, 44: 313-391. Ref_61 Drew, G. A., 1897. Notes on the embryology, anatomy, and habits of Yoldia limatula, Say. Johns Hopkins Univ. Circ., 17: 11-14. Ref_62 Drew, G. A., 1899a. The anatomy, habits, and embryology of Yoldia limatula, Say. Mem. Biol. Lab., Johns Hopkins Univ., 4: no. 3, 1-37. Ref_63 Drew, G. A., 1899b. Some observations on the habits, anatomy and embryology of members of the Protobranchia. Anat. Anz., 15: 493-519. Ref_64 Brooks, W. K., 1879. Preliminary observations upon the development of the marine prosobranchiate gasteropods. Stud. Biol. Lab., Johns Hopkins Univ., 1: no. 5, pp. 121-142. Ref_65 Bumpus, H. C., 1898. The breeding of animals at Woods Holl during the month of May, 1898. Science, 8: 58-61. Ref_66 Conklin, E. G., 1891. Preliminary note on the embryology of Crepidula fornicata and of Urosalpinx cinerea. Johns Hopkins Univ. Circ., 10: 89-90. Ref_67 Federighi, H., 1931. Studies on the oyster drill ( Urosalpinx cinerea, Say). Bull. U. S. Burl Fish., 47. 85-115. Ref_68 Federigtti, H., 1937. Culture methods for Urosalpinx cinerea. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 532-536. Ref_69 Hancock, D. A., 1956. The structure of the capsule and the hatching process in Urosalpinx cinerea (Say). Proc. Zool. Soc., London, 127: 565-571. Ref_70 Lebour, M. V., 1937. The eggs and larvae of the British prosobranchs with special reference to those living in the plankton. J. Mar. Biol. Assoc., 22: 105-166. Ref_71 Nelson, J. R., 1931. Trapping the oyster drill. New Jersey Agric. Exp. Stat. Bull. no. 523. Ref_72 Friedemann, O., 1902. Untersuchungen uber die postembryonale Entwicklung von Aurelia aurita. Zeitschr. f. wiss. Zool., 71: 227-267. Ref_73 Glichrist, F. G., 1937. Rearing the scyphistoma of Aurelia in the laboratory. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, p. 143. Ref_74 Hargitt, C. W., and G. T. Hargitt, 1910. Studies in tile development of Scyphomedusae. J. Morph., 21: 217-262. Ref_75 Hein, W., 1900. Untersuchungen fiber die Entwicklung von Aurelia aurita. Zeitschr. f. wiss. Zool., 67: 401-438. Ref_76 Macbride, E. W., 1914. Text-Book of Embryology. Vol. I. Invertebrata. Macmillan and Co., Ltd., London. Ref_77 Percival, E., 1923. On the strobilization of Aurelia. Quart. J. Micr. Sci., 67: 85-100. Ref_78 Smith, F., 1891. The gastrulation of Aurelia flavidula, Per. & Les. Bull. Mus. Comp. Zool., Harvard, 22: 115-124. Ref_79 Coe, W. R., 1912. Echinoderms of Connecticut. Conn. State Geol. and Nat. Hist. Surv., 19: 1-147. Ref_80 Fell, H. Barraclough 1946. The embryology of the viviparous ophiuroid Amphipholis squamata Delle Chiaje. Trans. Proc. N. Z. Inst., 75: 419-464. Ref_81 Fewkes, J. W., 1887. On the development of the calcareous plates of Amphiura. Bull. Mus. Comp. Zool., Harvard, 13: 107-150. Ref_82 Garstang, W., 1931. In: Plymouth Marine Fauna. Second edition, Mar. Biol. Assoc., U. K., p. 295. Ref_83 Gross, F., 1937. Notes on the culture of some marine plankton organisms. J. Mar. Biol. Assoc., 21: 753-768. Ref_84 Ludwig, H., 1881. Zur Entwicklungsgeschichte der Ophiurenskelettes. Zeitschr. f. wiss. Zool., 36: 181-200. Ref_85 Macbride, E. W., 1893. The development of the genital organs, ovoid gland, axial and aboral sinuses in Amphiura squamata; together with some remarks on Ludwig's haemal system in this Ophiurid. Quart. J. Micr. Sci, 34: 129-153. Ref_86 Macbride, E. W., 1914. Text-Book of Embryology. Vol. I. Invertebrata. Macmillan and Co., Ltd., London, pp. 498-501. Ref_87 Metschnikoff, E., 1869. Studien über die Entwickelung der Echinodermen und Nemertinen. Mem. d. l'Acad Imp. des sci., St. Petersbourg, 7e ser., 14: 8, pp. 1-73. Ref_88 Osburn, R. C., 1910. The Bryozoa of the Woods Hole region. Bull. U. 5. Burl Fisheries, 30:205-266. Ref_89 Rogick, M. D., 1948. Studies on marine bryozoa. Ii. Barentsia laxa Kirkpatrick 1890. Biol. Bull., 94: 128-142. (See, also, references for Pedicellina.). Ref_90 Berrill, N. J., 1937. Culture methods for ascidians. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 564-571. Ref_91 Berrill, N. J., 1941a. The development of the bud in Botryllus. Biol. Bull., 80: 169-184. Ref_92 Berrill, N. J., 1941b. Size and morphogenesis in the bud of Botryllus. Biol. Bull., 80: 185-193. Ref_94 Grave, C., 1937. Notes on the culture of eight species of ascidians. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 560-564. Ref_95 Grave, C., and P. A. Nichol, 1939. Studies of larval life and metamorphosis in Ascidia nigra and species of Polyandrocarpa. Pap. Tortugas Lab., 32: 1-46. (Carnegie Inst., Wash., Publ. no. 517.). Ref_96 Grave, C., and G. Riley, 1935. Development of the sense organs of the larva of Botryllus schlosseri. J. Morph., 57: 185-211. Ref_97 Grave, C., and H. Woodbridge, 1924. Botryllus schlosseri (Pallas): The behavior and morphology of the free-swimming larva. J. Morph., 39: 207-247. Ref_98 Herdman E. C., 1924. Botryllus. Mem. Liverpool Mar. Biol. Comm., 26: 1-40. Ref_99 Oka, H., and H. Watanabe, 1957. Vascular budding, a new type of budding in Botryllus. Biol. Bull., 112: 225-240. Ref_100 Pizon, A., 1893. Histoire de la blastogenese chez les Botryllides. Ann. Sci. Nat., Zool., ser. 7, 14: 1-386. Ref_102 Watterson R. L., 1945. Asexual reproduction in the colonial tunicate, Botryllus schlosseri ( Pallas ) Savigny, with special reference to the developmental history of intersiphonal bands of pigment cells. Biol. Bull., 88: 71-103. Ref_103 Coe, W. R., 1933. Sexual phases in Teredo. Biol. Bull., 65: 283 303. Ref_104 Coe, W. R., 1934. Sexual rhythm in the pelecypod mollusk Teredo. Science, 80: 192. Ref_105 Coe, W. R., 1936. Sequence of functional sexual phases in Teredo. Biol. Bull., 71: 122-132. (Also in Coll. Pap., Osborn Zool. Lab., Yale Univ., vol. 18.). Ref_106 Coe, W. R., 1941. Sexual phases in wood-boring mollusks. Biol. Bull., 81: 168-176. Ref_107 Grave, B. H., 1928. Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. Biol. Bull., 55: 260-282. Ref_108 Grave, B. H., 1933. Rate of growth, age at sexual maturity, and duration of life of certain sessile organisms, at Woods Hole, Massachusetts. Biol. Bull., 65: 375-386. Ref_109 Grave, B. H., 1937. Rearing Teredo navalis. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 545-546. Ref_110 Grave, B. H., 1942. The sexual cycle of the shipworm, Teredo navalis. Biol. Bull., 82: 438445. Ref_111 Grave, B. H., and J. Smith, 1936. Sex inversion in Teredo navalis and its relation to sex ratios. Biol. Bull., 70: 332-343. Ref_112 Hatschek, B., 1880. Ueber Entwicklungsgeschichte von Teredo. Arb. Zool. Inst., Wien, 3: 1-44. Ref_113 Lane, C. E., J. Q. Tierney and R. E. Hennacy, 1954. The respiration of normal larvae of Teredo bartschi Clapp. Biol. Bull., 106: 323-327. Ref_114 Lasker, R., and C. E. Lane, 1953. The origin and distribution of nitrogen in Teredo bartschi Clapp. Biol. Bull., 105: 316-319. Ref_115 Sigerfoos, C. P., 1908. Natural history, organization, and late development of the Teredinidae, or ship-worms. Bull. U. 5. Burl Fish., 27: 191-231. Ref_116 Turner, R., 1947. Collecting ship-worms. Spec. Publ. Limnological Soc. of Amer., no. 19. Ref_117 Bresslau, E., 1933. Turbellaria. Kükenthal-Krumbach Handbuch der Zoologie, Bd. 2. Ref_118 Costello, D. P., 1937. The early cleavage of Polychoerus carmelensis. Anat. Rec., 70: Suppl.1, 108-109. Ref_119 Costello, D. P., 1946. The giant cleavage spindle of the egg of Polychoerus carmelensis Anat. Rec., 96: 561. Ref_120 Costello, D. P., 1948. Spiral cleavage. Biol. Bull., 95: 265. (See, also, Erratum, Biol. Bull., 95: 361.). Ref_121 Costello, D. P., and H. M. Costello, 1938. A new species of Polychoerus from the Pacific Coast. Ann. and Mag. Nat. Hist., ser. 11, 1: 148-155. Ref_122 Costello, H. M., and D. P. Costello, 1938. Copulation in the acoelous turbellarian Polychoerus carmelensis. Biol. Bull., 75: 85-98. Ref_123 Costello, H. M., and D. P. Costello, 1939. Egg laying in the acoelous turbellarian Polychoerus carmelensis. Biol. Bull., 76: 80-89. Ref_124 Gardiner, E. G., 1895. Early development of Polychoerus caudatus, Mark. J. Morph., 11: 155-176. Ref_125 Gardiner, E. G., 1898. The growth of the ovum, formation of the polar bodies, and the fertilization in Polychoerus caudatus. J. Morph., 15: 73-110. Ref_126 Löhner L., 1910. Untersuchungen über Polychoerus caudatus Mark. Zeikchr. f. w1ss. Zool., 95: 451-506. Ref_127 Mark, E. L., 1892. Polychoerus caudatus, nov. gen. et nov. spec. Festschr. z. 70. Geburtstage R. Leuckarts. Leipzig. S. 298-309. Ref_128 Cori, C. J., 1933. Dritter Cladus der Vermes Amera. Kamptozoa. Allgemeines fiber den Cladus Kamptozoa. Erste und einzige Klasse des Cladus Kamptozoa; Kamptozoa = Bryozoa Entoprocta=Calyssozoa. Kükenthal Handbuch d. Zool., 2: Hft. 1 (5), 1-64. Ref_129 Harmer, S. F., 1887. On the life-history of Pedicellina. Quart. J. Micr. Sci, 27: 239-263. Ref_130 Hatschek, B., 1877. Embryonalentwicklung und Knospung der Pedicellina echinata. Zeitschr.f. wiss. Zool., 29: 502-549. Ref_131 Hyman, L. H., 1951. The Invertebrates: Acanthocephala, Aschelminthes, and Entoprocta. Ref_132 Marcus, E., 1939. Briozóarios Marinhos Brasileiros. Iii. Boll d. Fill Cien., e Let., Univ. de Sao Paulo, Zool., 3: 111-291. Ref_133 Barer, E. G. S., 1936. Photoperiodicity in the spawning reaction of Pennaria tiarella Mccr. Proc. Indiana Acad. Sci., 45: 251-252. Ref_134 Ballard, W. W., 1942. The mechanism for synchronous spawning in Hydractinia and Pennaria. Biol. Bull., 82: 329-339. Ref_135 Berrill, N. J., 1952. Growth and form in gymnoblastic hydroids. Ii. Sexual and asexual reproduction in Rathkea. Iii. Hydranth and gonophore development in Pennaria and Acaulis. Iv. Relative growth in Eudendrium. J. Morph., 90:.1-32. Ref_136 Goette, A., 1907. Vergleichende Entwicklungsgeschichte der Geschlechtsindividuen der Hydropolypen. Zeitschr. f. wiss. Zool., 87: 1-336. Ref_137 Hargitt, C. W., 1900. A contribution to the natural history and development of Pennaria tiarella Mecr. Amer. Nat., 34: 387-415. Ref_138 Hargitt, G. T., 1909. Maturation, fertilization, and segmentation of Pennaria tiarella (Ayres) and of Tubularia crocea (Ag.). Bull. Mus. Comp. Zool., Harvard, 53: 159-212. Ref_139 Hargitt, G. T., 1919. Germ cells of coelenterates. Vi. General considerations, discussion, conclusions. J. Morph., 33: 1-58. Ref_141 Nutting, C. C., 1901. The hydroids of the Woods Hole region. Bull. U. S. Fish Comm., 19: 325-386. Ref_142 Smallwood, M., 1899. A contribution to the morphology of Pennaria tiarella Mccrady. Amer. Nat., 33: 861-870. Ref_143 Smallwood, W. M., 1909. A reexamination of the cytology of Hydraetinia and Pennaria. Biol. Bull., 17: 209-240. Ref_144 Brooks, W. K., 1886. The life-history of the Hydromedusae. Mem. Boston Soc. Nat. Hist. 3: 359-430. Ref_145 Brooks, W. K., and S. Rittenhouse, 1907. On Turritopsis nutricula (Mccrady). Proc. Boston Soc. Nat. Hist., 33: 429-460. Ref_147 Colwin, L. H., 1948. Note on the spawning of the holothurian, Thyone briareus (Lesueur). Biol. Bull., 95: 296-306. Ref_148 Colwin, L. H., and A. L. Colwin, 1956. The acrosome filament and sperm entry in Thyone briareus (Holothuria) and Asterias. Biol. Bull., 110: 243-257. Ref_149 Edwards, C. L., 1909. The development of Holothuria floridana Pourtales with especial reference to the ambulacral appendages. J. Morph., 20: 211-230. Ref_15 Kowalevsky, A., 1874. Über die Knospung der Ascidien. Arch. f. miter. Anat., 10: 441-470. Ref_150 Grave, C., 1902. A method of rearing marine larvae. Science, 15: 579-580. Ref_151 Just, E. E., 1929. The production of filaments by echinoderm ova as a response to insemination, with special reference to the phenomenon as exhibited by ova of the genus Asterias. Biol. Bull., 57: 311-325. Ref_153 Mead, A. D., 1898. The breeding of animals at Woods Holl during the month of April, 1898. Science, 7: 702-704. Ref_154 Ohshtma, H., 1921. On the development of Cucumaria echinata v. Marenzeller. Quart. J. Micr. Sci., 65: 173-246. Ref_155 Ohshima, H., 1925a. Notes on the development of the sea-cucumber, Thyone briareus. Science, 61: 420-422. Ref_156 Ohshima, H., 1925b. Pri la maturigo kaj fekundigo ce la ovo de l'markukumoj. Bulteno Scienca de la Facultato Terkultura; Kyusu Imp. Univ., 1: no. 2, pp. 100-106 (in Japanese and Esperanto). Ref_157 Van Beneden, É. and Ch. Julin, 1884. La segmentation chez les Ascidiens et ses rapports avec l'organization de la larve. arch. de Biol., 5: 111-126. Ref_158 Berrill, N. J., 1929. Studies in tunicate development. I. General physiology of development of simple ascidians. Phil. Trans. Roy. Soc., London, ser. B, 218: 37-78. Ref_160 Castle, W. E., 1896. The early embryology of Ciona intestinalis, Flemming (L.). Bull. Mus. Comp. Zool., Harvard, 27: no. 7, pp. 203-280. Ref_161 Cohen, A., and N. J. Berrill, 1936. The early development of ascidian eggs. Biol. Bull., 70: 78 88. Ref_162 Conklin, E. G., 1905a. The organization and cell-lineage of the ascidian egg. J. Acad. Nat. Sci., Philadelphia, ser. 2, part 1, 13: 1-119. Ref_163 Conklin, E. G., 1905b. Mosaic development in ascidian eggs. J. Exp. Zool., 2: 145-223. Ref_164 Conklin, E. G., 1905c. Organ-forming substances in the eggs of ascidians. Biol. Bull., 8: 205-230. Ref_165 Conklin, E. G., 1931. The development of centrifuged eggs of ascidians. J. Exp. Zool., 60: 1-120. Ref_166 Rose, S. M., 1939. Embryonic induction in the Ascidia. Biol. Bull., 77: 216-232. Ref_168 Agassiz, A., and C. O. Whitman, 1885. The development of osseous fishes. I. The pelagic stages of young fishes. Mem. Mus. Comp. Zool., Harvard, 14: no. 1, part 1, pp. 1-56. Ref_169 Breder, C. M., Jr., 1948. Field Book of Marine Fishes of the Atlantic Coast from Labrador to Texas. G. P. Putnam's Sons, New York. (Rev. ea.). Ref_170 Clapp, C. M., 1891. Some points in the development of the toad-fish (Batrachus tau). J. Morph., 5: 494-501. Ref_171 Clapp, C. M., 1898. Relation of the axis of the embryo to the first cleavage plane. Biol. Lectures M. B. L., Wood's Holl, Mass., pp. 139-151. Ref_172 Clapp, C. M., 1899. The lateral line system of Batrachus taut J. Morph., 15: 223-264. Ref_173 Cohn, L., 1904. Ueber die Bruttasche von Syngnathus typhle. Anat. Anz., 24: 192-199. Ref_174 Cunningham, J. T., 1895. Experiments and observations made at the Plymouth Laboratory. Ii. The development of the egg in flat fishes and pipe-fishes. J. Mar. Biol. Assoc., 3: 258-270. Ref_175 Huot, A., 1902. Recherches sur les poissons lophobranches. Ann. des Sci. Nat., Zool., ser. 8, 14: 197-288. Ref_176 Newman, H. H., 1907. Spawning behavior and sexual dimorphism in Fundulus heteroclitus and allied fish. Biol. Bull., 12: 314-348. Ref_177 Newman, H. H., 1915. Development and heredity in heterogenic teleost hybrids. J. Exp. Zool., 18: 511-576. Ref_178 Newman, H. H., 1918. Hybrids between Fundulus and mackerel. A study of paternal heredity in heterogenic hybrids. J. Exp. Zool., 26: 391-421. Ref_179 Russell, A., 1939. Pigment inheritance in the Fundulus-Scomber hybrid. Biol. Bull.,., 77: 423-431. Ref_180 Sumner, F. B., 1903. A study of early fish development. Experimental and morphological. Arch. f. Entw., 17: 92-149. Ref_181 Wallace, L. B., 1899. The germ-ring in the egg of the toad-fish (Batrachus tau). J. Morph., 15: 9-16. Ref_182 Worley, L. G., 1933. Development of the egg of the mackerel at different constant temperatures. J. Gen. Physiol., 16: 841-857. Ref_183 Allen, R. D., 1953. Fertilization and artificial activation in the egg of the surf-clam, Spisula solidissima. Biol. Bull., 105: 213-239. Ref_184 Belding, D. L., 1910. The growth and habits of the sea clam, Mactra solidissima. Ann. Rep. Comm. Fish and Game, Massachusetts, 1909, pp. 26-41. Ref_185 Kostanecki, K., 1902. Ueber künstliche Befruchtung und künstliche parthenogenetische\ Furchung bei Mactra. Bull. de l'Acad. des Sci., Cracovie, Cl. des Sci. Math. et Natur., Juillet, 1902, pp. 363-387. Ref_186 Kostanecki, K., 1904. Cytologische Studien an künstlich parthenogenetisch sich entwickelnden Eiern von Mactra. Arch. f. mikr. Anat., 64: 1-98. Ref_187 Kostanecki, K., 1908. Zur Morphologie der künstlichen parthenogenetischen Entwicklung bei Mactra. Arch. f. miter. Anat., 72: 327-352. Ref_188 Kostanecki, K., 1911. Experimentelle Studien an den Eiern von Mactra. Bull. de l'Acad. des Sci., Cracovie, Cl. des Sci. Math. et Natur., ser. B, Mars, 1911, pp. 146-161. Ref_189 Loosanoff, V. L., 1954. New advances in the study of bivalve larvae. Amer. Sci., 42: 607-624. Ref_190 Meisenheimer, J., 1901. Entwicklungsgeschichte von Dreissensia polymorpha Pall. Zeitschr. f. wiss. Zool., 69: 1-137. Ref_191 Prytherch H. F., 1937. The cultivation of lamellibranch larvae. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 539-542. Ref_192 Schechter, V., 1936. Comparative hypotonic cytolysis of several types of invertebrate egg cells and the influence of age. Biol. Bull., 71: 410. Ref_193 Schechter, V., 1937. Calcium and magnesium in relation to longevity of Mactra, Nereis and Hydroides egg cells. Biol. Bull., 73: 392. Ref_194 Schechter, V., 1941. Experimental studies upon the egg cells of the clam, Mactra solidissima, with special reference to longevity. J. Exp. Zool., 86: 461-477. Ref_195 Sclufer, E., 1955. The respiration of Spisula eggs. Biol. Bull., 109: 113-122. Ref_196 Bateson W., 1884. The early stages in the development of Balanoglossus (sp. incert.). Quart. J. Micr. Sci., 24: 208-236. Ref_197 Bateson, W., 1885. The later stages in the development of Balanoglossus kowalevskii, with a suggestion as to the affinities of the Enteropneusta. Quart. J. Micr. Sci., 25: Suppl. 81-122. Ref_198 Colwin, A. L., and L. H. Colwin, 1950. The developmental capacities of separated early blastomeres of an enteropneust, Saccoglossus kowalevskii. J. Exp. Zool., 115: 263-295. Ref_199 Colwin, A. L., and L. H. Colwin, 1951. Relationships between the egg and larva of Saccoglossus kowalevskii (Enteropneusta): Axes and planes; general prospective significance of the early blastomeres. J. Exp. Zool., 117: 111-137. Ref_200 Colwin, A. L., and L. H. Colwin, 1953. The normal embryology of Saccoglossus kowalevskii (Enteropneusta). J. Morph., 92: 401-453. Ref_201 Colwin, L. H., and A. L. Colwin, 1954a. Fertilization changes in the membranes and cortical granular layer of the egg of Saccoglossus kowalevskii (Enteropneusta). J. Morph., 95: 1-45. Ref_202 Colwin, L. H., and A. L. Colwin, 1954b. Sperm penetration and the fertilization cone in the egg of Saccoglossus kowalevskii (Enteropneusta). J. Morph., 95: 351-371. Ref_203 Fauré-Fremiet, E., 1924. L'oeuf de Sabellaria alveolata L. Arch. d'Anat. Micr., 20: 211-342. Ref_204 Harris, J. E., 1935. Studies on living protoplasm. I. Streaming movements in the protoplasm of the egg of Sabellaria alveolata (L.). J. Exp. Biol., 12: 65-79. Ref_205 Hatt, P., 1931. La fusion expérimentale d'oeufs de "Sabellaria alveolata L." et leur developpement. Arch. Biol., 42: 303-323. Ref_206 Hatt, P., 1932. Essais experimentaux sur les localisations germinales dans l'oeuf d'un Annelide (Sabellaria alveolata L.). Arch. d'Anat. Micr., 28: 81-98. Ref_207 Novikoff, A. B., 1937. Sabellaria vulgaris. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 187-191. Ref_208 Novikoff, A. B., 1938a. Embryonic determination in the annelid, Sabellaria vulgaris. I. The differentiation of ectoderm and endoderm when separated through induced exogastrulation. Biol. Bull., 74: 198-210. Ref_209 Novikoff, A. B., 1938b. Embryonic determination in the annelid, Sabellaria vulgaris. Ii. Transplantation of polar lobes and blastomeres as a test of their inducing capacities. Biol. Bull., 74: 211-234. Ref_210 Novikoff, A. B., 1939. Surface changes in unfertilized and fertilized eggs of Sabellaria vulgaris. J. Exp. Zool., 82: 217-237. Ref_211 Novikoff, A. B., 1940. Morphogenetic substances or organizers in annelid development. J. Exp. Zool., 85: 127-155. Ref_212 Waterman, A. J., 1934. Observations on reproduction, pre-maturation, and fertilization in Sabellaria vulgaris. Biol. Bull., 67: 97-114. Ref_213 Waterman, A. J., 1936. The membranes and germinal vesicle of the egg of Sabellaria vulgaris. Biol. Bull., 71: 46-58. Ref_214 Wilson, D. P., 1929. The larvae of the British Sabellarians. J. Mar. Biol. Assoc., 16: 221268. Ref_215 Berrill, N. J., 1953. Growth and form in gymnoblastic hydroids. Vi. Polymorphism within the Hydractiniidae. J. Morph., 92: 241-272. Ref_216 Bunting, M., 1894. The origin of the sex cells in Hydractinia and Podocoryne; and the development of Hydractinia. J. Morph., 9: 203-236. Ref_218 Goette, A., 1916. Die Gattungen Podocoryne, Stylactis und Hydractinia. Zool. Jahr. abt. Syst., Geog., Okol. Tiere, 39: 443-510. Ref_219 Hargitt, C. W., 1901. Synopses of North-American Invertebrates. Xiv. The Hydromedusae. Amer. Nat., 35: 301-315, 379-395, 575-595. Ref_220 Mayer, A. G., 1910. Medusae of the world. I and Ii. The Hydromedusae. Carnegie Inst. Wash. Pub. 109. Ref_221 De Varenne, M. A., 1882. Developpement de l'oeuf de la Podocoryne carnea. C. R. Acad. Sci., 94: 892-894. Ref_225 Treadwell, A. L., 1901. The cytogeny of Podarke obscura Verrill. J. Morph., 17: 399-486. Ref_226 Treadwell, A. L., 1902. Notes on the nature of "artificial parthenogenesis" in the egg of Podarke obscura. Biol. Bull., 3: 235-240. Ref_228 Just, E. E., 1915a. An experimental analysis of fertilization in Platynereis megalops. Biol. Bull., 28: 93-114. Ref_229 Just, E. E., 1915b. The morphology of normal fertilization in Platynereis megalops. J. Morph. 26: 217-233. Ref_230 Just, E. E., 1922. On rearing sexually mature Platynereis megalops from eggs. Amer. Nat., 56: 471-478. Ref_231 Just, E. E., 1929. Effects of low temperature on fertilization and development in the egg of Platynereis megalops. Biol. Bull., 57: 439-442. Ref_232 Just, E. E., 1939. The Biology of the Cell Surface. P. Blakiston's Son & Co., Inc., Philadelphia. Ref_234 Sullivan, C. M., 1948. Bivalve veliger larvae of Malpeque Bay, P. E. I. Bull. Fish. Res. Bd., Canada, no. 77, pp. 1-36. Ref_235 Gerould, J. H., 1903. Studies on the embryology of the Sipunculidae. I. The embryonal envelope and its homologue. Mark Anniv. Vol., no. 22, pp. 437-452. Ref_236 Gerould, J. H., 1907. The development of Phascolosoma. (Studies on the embryology of the Sipunculidae Ii.) Zool. Jahrb., abt. Anat. ". Ontog., 23: 77-162. Ref_237 Just, E. E., 1939. Basic Methods for Experiments on Eggs of Marine Animals. P. Blakiston's Son and Co., Inc., Philadelphia, p. 33. Ref_239 Wilson, D. P., 1936. Notes on the early stages of two polychaetes, Nephthys hombergi Lamarck and Pectinaria koreni Malmgren. J. Mar. Biol. Assoc., 21: 305-310. Ref_240 Berrill, N. J., 1935a. Studies in tunicate development. Iii. Differential retardation and acceleration. Phil. Trans. Roy. Soc., London, ser. B, 225: 255-326. Ref_241 Berrill, N. J., 1935b. Studies in tunicate development. Iv. Asexual reproduction. Phil. Trans. Roy. Soc., London, ser. B, 225: 327-379. Ref_244 Grave, C., and G. K. Mccosh, 1923. Perophora viridis (Verrill). The activities and structure of the free-swimming larva. Washington Univ. Stud., Sci. ser., 11: 89-116. Ref_245 Huxley, J. S., 1921. Studies in dedifferentiation. Ii. redifferentiation and resorption in Perophora. Quart. J. Micr. Sci., 65: 643-697. Ref_246 Pitter, W. E., 1897. Budding in compound ascidians, based on studies on Goodsiria and Perophora. J. Morph., 12: 149-238. Ref_247 Barnes, H., and D. J. Crisp, 1956. Evidence of self-fertilization in certain species of barnacles J. Mar. Biol. Assoc., 35: 631-639. Ref_248 Burbancx, W. D., M. E. Pierce and G. C. Whiteley, Jr., 1956. A study of the bottom fauna of Rand's Harbor, Massachusetts: An application of the ecotone concept. Ecol Monog., 26: 213-243. Ref_249 Costlow, J. D., Jr., 1956. Shell development in Balanus improvisus Darwin. J. Morph., 99 : 359-415. Ref_250 Costlow, J. D., Jr., and C. G. Bookhout, 1953. Moulting and growth in Balanus improvisus. Biol. Bull., 105: 420-433. Ref_251 Costlow, J. D., Jr., and C. G. Bookhout, 1956. Molting and shell growth in Balanus amphitrite niveus. Biol. Bull., 110: 107-116. Ref_252 Costlow, J. D., Jr., and C. G. Bookhout, 1957. Larval development of Balanus eburneus in the laboratory. Biol. Bull., 112: 313-324. Ref_253 Crisp, D. J., 1956. A substance promoting hatching and liberation of young in Cirripedes. Nature, 178: 263. Ref_254 Doochin, H. D., 1951. The morphology of Balanus improvisus Darwin and Balanus amphitrite niveus Darwin during initial attachment and metamorphosis. Bull. Mar. Sci Gulf and Caribbean, 1: 15-39. Ref_255 Fish, C. J., 1925. Seasonal distribution of the plankton of the Woods Hole region. Burl Fish., Document no. 975. Ref_256 Groom, T. T., 1894. On the early development of Cirripedia. Phil. Trans. Roy. Soc., London, ser. B, 185: 119-232. Ref_258 Fewkes, J. W., 1886. Preliminary observations on the development of Ophiopholis and Echinarachnius. Bull. Mus. Comp. Zool., Harvard, 12: 105-152. Ref_260 Olsen, H., 1942. The development of the brittle-star Ophiopholis aculeata (O. Fr. Müller) with a short report on the outer hyaline layer. Bergens Mus. Arb., 1942, Naturv. Rekke Nr. 6, S. 1-107. Ref_261 Brooks, W. K., and C. Grave, 1899. Ophiura brevispina. Mem. Nat. Acad. Sci., 8: 79 - 100. Also in Mem. Biol. Lab., Johns Hopkins Univ., 4: no. 5, pp. 79-100. Ref_262 Grave, C., 1916. Ophiura brevispina. Ii. An embryological contribution and a study of the effect of yolk substance upon development and developmental processes. J. Morph., 27: 413-451. Ref_263 Faulkner, G. H., 1929. The early prophases of the first oocyte division as seen in life, in Obelia geniculata. Quart. J. Micr. Sci., 73: 225-242. Ref_266 Merejkowsky C., 1883. Histoire du developpement de la meduse Obelia. Bull. Soc. Zool. France, 8: 98-129. Ref_268 Drew, G. A., 1899. Some observations on the habits, anatomy, and embryology of members of the Protobranchia. Anat. Anz., 15: 493-519. Ref_270 Carpenter, W. B., 1855. On the development of the embryo of Purpura lapillus. Trans. Micr. Soc., London, 3: 17-30. Ref_271 Carpenter, W. B., 1857. Remarks on Mm. Koren and Danielssen's researches on the development of Purpura lapillus. Ann. and Mag. Nat. Hist., ser. 2, 20: 16-21. Ref_272 Koren, J., and D. C. Danielssen, 1857a. Researches on the development of the Pectinibranchiata. Ann. and Mag. Nat. Hist., ser. 2, 19: 353-366. Ref_273 Koren, J., and D. C. Danielssen, 1857b. Researches on the development of the Pectinibranchiata. Ann. and Mag. Nat. Hist., ser. 2, 19: 433-442. Ref_274 Mcmurrich, J. P., 1886. A contribution to the embryology of the prosobranch gasteropods. Stud. Biol. Lab., Johns Hopkins Univ., 3: 403-450. Ref_275 Moore, H. B., 1936. The biology of Purpura lapillus. I. Shell variation in relation to environment. J. Mar. Biol. Assoc., 21: 61-89. Ref_276 Moore, H. B., 1938. The biology of Purpura lapillus. Iii. Life history and relation to environmental factors. J. Mar. Biol. Assoc., 23: 67-74. Ref_277 Pelseneer, P., 1911. Recherches sur l'embryologie des Gasteropods. Mem. Acad. Roy., Belgique, ser. 2, 3: 1-167. Ref_278 Portmann, A., 1925. Der Einfluss der Nahreier auf die Larvenentwicklung von Buccinum undpurpura. Zeitschr. f. Morph. u. Okol. Tiere, 3: 526-541. Ref_279 Portmann, A., 1931. Die Entstehung der Nahreier bei Purpura lapillus durch atypische Befruchtung. Zeitschr. f. Zellforsch. u. miter. Anat., 12: 167-178. Ref_280 Selenra, E., 1872. Die Anlage der Keimblatter bei Purpura lapillus. Niederland. Arch. f. Zool., 1: 211-218, Wilson, H. V., 1900. Marine biology at Beaufort Amer. Nat., 34: 339-360. Ref_281 Wilson, H. V., 1891. Notes on the development of some sponges. J. Morph., 5: 511-519. Ref_282 Wilson, H. V., 1894. Observations on the gemmule and egg development of marine sponges. J. Morph., 9: 277-406. Ref_283 Wilson, H. V., 1898. On the feasibility of raising sponges from the egg. Bull. U. S. fish Comm., 17: 241-245. Ref_284 Wilson, H. V., 1935. Some critical points in the metamorphosis of the halichondrine sponge larva. J. Morph., 58: 285-353. Ref_285 Wilson, H. V., 1937. Notes on the cultivation and growth of sponges from reduction bodies dissociated cells, and larvae. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 137-139. Ref_286 Ayers, J. C., 1956. Population dynamics of the marine clam, Mya arenaria. Limn. and Oceanog., 1: 26-34. Ref_287 Battle, H. I., 1932. Rhythmic sexual maturity and spawning of certain bivalve mollusks. Contr. Canadian Biol. and Fish., 7: 255-276. Ref_288 Belding, D. L., 1915. A report upon the clam fishery. 50th Ann. Rep., Comm. Fish and Game, Massachusetts, pp. 93-234. Ref_289 Bumpus, H. C., 1898. The breeding habits of animals at Woods Holl during the months of June, July and August. Science, 8: 850-858. Ref_291 Kellogg, J. L., 1899. Special report on the life-history of the common clam, Mya arenaria. 29th Ann. Rep., Comm. Inland Fish., Rhode Island, 1898, pp. 78-95. Ref_293 Mead, A. D., 1900. Observations on the soft-shell clam. 30th Ann. Rep., Comm. Inland Fish., Rhode Island 1899, pp. 20-42. Ref_294 Mead, A. D., 1901. Observations on the soft-shell clam. 31st Ann. Rep., Comm. Inland Fish., Rhode Island, 1900, pp. 21-44. Ref_295 Mead, A. D., 1902. Observations on the soft-shell clam. 32nd Ann. Rep., Comm. Inland Fish., Rhode Island, 1901, pp. 20-33. Ref_296 Mead, A. D., and E. W. Barnes, 1903. Observations on the soft-shell clam (Mya arenaria). 33rd Ann. Rep., Comm. Inland Fish., Rhode Island, 1902, pp. 29-48. Ref_297 Mead, A. D., and E. W. Barnes, 1904. Observations on the soft-shell clam. 34th Ann. Rep., Comm. Inland Fish., Rhode Island, 1903, pp. 29-68. Ref_298 Nelson, T. C., 1928. On the distribution of critical temperatures for spawning and for ciliary activity in bivalve molluscs. Science, 67: 220-221. Ref_299 Prytherch, H. F., 1937. The cultivation of lamellibranch larvae. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 539-543. Ref_30 Harvey, E. B., 1940. A note on determining the sex of Arbacia punctulata. Biol. Bull., 79: 363. Ref_300 Stafford, J., 1901. The clam fishery of Passamaquoddy Bay. Contr. Canadian Biol., 1901, pp. 19-40. Ref_301 Stafford, J., 1909. On the recognition of bivalve larvae in plankton collections. Contr. Canadian Biol., 1906-1910, pp. 221-242. Ref_302 Sullivan, C. M., 1948. Bivalve larvae of Malpeque Bay, P. E. I. Bull. Fish. Res. Bd. Canada, no. 77, pp. 1-36. Ref_303 Berrill, N. J., 1931. Studies in tunicate development. Ii. Abbreviation of development in the Molgulidae. Phil. Trans. Roy. Soc., London, ser. B, 219: 281-346. Ref_304 Berrill, N. J., 1932. The mosaic development of the ascidian egg. Biol. Bull., 63: 381-386. Ref_306 Conklin, E. G., 1905. The organization and cell-lineage of the ascidian egg. J. Acad. Nat. Sci, Philadelphia, ser. 2, 13: 1-119. Ref_307 Grave, C., 1926. Molgula citrina (Alder and Hancock). Activities and structure of the free swimming larva. J. Morph., 42: 453-471. Ref_309 Berrill, N. J., 1935. Studies in tunicate development. Iii. Differential retardation and acceleration. Phil. Trans. Roy. Soc., London, ser. B, 225: 255-326. Ref_311 Agassiz, L., 1862. Contributions to the Natural History of the United States of America. Vols. 3 and 4. Little, Brown and Co., Boston. Ref_313 Mcmurrich, J. P., 1891. The development of Cyanea arctica. Amer. Nat. 25: 287-289. Ref_314 Okada, Y. K., 1927. Sur l'origine de l'endoderme des discomeduses. Buli. Biol. France et Belg., 61: 250-262. Ref_315 Clark, L. B., and W. N. Hess, 1940a. Swarming of the Atlantic Palolo worm, Leodice fucata (Ehlers). Pap. Tortugas Lab., 33: 21-70. (Carnegie Inst., Wash., Publ. no. 524.). Ref_316 Clark, L. B., and W. N. Hess, 1940b. The reactions of the Atlantic Palolo, Leodice fucafa, to light. Pap. Tortugas Lab., 33: 71-81. (Carnegie Inst., Wash., Publ. no. 524.). Ref_317 Costello, D. P., 1939. The volumes occupied by the formed cytoplasmic components in marine eggs. Physiol. Zool., 12: 13-20. Ref_318 Costello, D. P., 1940a. The cell origin of the prototroch of Nereis limbata. Biol. Bull., 79: 369-370. Ref_319 Costello, D. P., 1940b. The fertilizability of . nucleated and non-nucleated fragments of centrifuged Nereis eggs. J. Morph., 66: 99-114. Ref_320 Costello, D. P., 1945a. Experimental studies of germinal localization in Nereis. I. The development of isolated blastomeres. J. Exp. Zool., 100: 19-66. Ref_321 Costello, D. P., 1945b. Segregation of ooplasmic constituents. J. Elisha Mitchell Sci Soc., 61: 277-289. Ref_322 Costello, D. P., 1948. Ooplasmic segregation in relation to differentiation. Ann. N. Y. Acad. Sci., 49: 663-683. Ref_323 Costello, D. P., 1949. The relations of the plasma membrane, vitelline membrane, and jelly in the egg of Nereis limbata. J. Gen. Physiol., 32: 351-366. Ref_324 Costello, D. P., and R. A. Young, 1939. Mechanism of membrane elevation in egg of Nereis limbata. Coll. Net, 14: 209, 214-215. Ref_325 Fox, H. M., 1924. Lunar periodicity in reproduction. Proc. Roy. Soc., London, ser. B, 95: 523-550. Ref_326 Hempelmann, F., 1911. Zur Naturgeschichte von Nereis dumerilii Aud. et Edw. Zoologica, 25: Hft. 62, 1-135. Ref_327 Hoadley, L., 1934. Pulsations in the Nereis egg. Biol. Bull., 67: 484-493. Ref_328 Iwanoff, P. P., 1928. Die Entwicklung der Larvalsegmente bei den Anneliden. Zeitschr. Morph. u. Okol., 10: 62-161. Ref_329 Izuka, A., 1903. Observations on the Japanese Palolo, Ceratocephale osawai, n. sp. J. Coll. sci. Imp. Univ., Tokyo, 17: no. 11, 1-37. Ref_330 Just, E. E., 1912. The relation of the first cleavage plane to the entrance point of the sperm. Biol. Bull., 22: 239-252. Ref_331 Just, E. E., 1914. Breeding habits of the heteronereis form of Platynereis megalops at Woods Hole, Mass. Biol. Bull., 27: 201-212. Ref_332 Just, E. E., 1915. The morphology of normal fertilization in Platynereis megalops. J. Morph. 26: 217-233. Ref_334 Just, E. E., 1930a. Hydration and dehydration in the living cell. Iii. The fertilization capacity of Nereis eggs after exposure to hypotonic sea-water. Protoplasma, 10: 24-32. Ref_335 Just, E. E., 1930b. Hydration and dehydration in the living cell. Iv. Fertilization and development of Nereis eggs in dilute sea-water. Protoplasma, 10: 33-40. Ref_336 Just, E. E., 1939a. The Biology of the Cell Surface. P. Blakiston's Son & Co., Inc., Philadelphia. Ref_337 Just, E. E., 1939b. Basic Methods for Experiments on Eggs of Marine Animals. P. Blakiston's Son & Co., Inc., Philadelphia. Ref_338 Lillie, F. R., 1911. Studies of fertilization in Nereis. I. The cortical changes in the egg: Ii. Partial fertilization. J. Morph., 22: 361-393. Ref_339 Lillie, F. R., 1912. Studies of fertilization in Nereis. Iii. The morphology of the normal fertilization of Nereis. Iv. The fertilizing power of portions of the spermatozoon. J. Exp. Zool., 12: 413 477. Ref_340 Lillie, F. R., and E. E. Just, 1913. Breeding habits of the heteronereis form of Nereis limbata at Woods Hole, Mass. Biol. Bull., 24: 147-168. Ref_341 Lovelace, R., 1949. The effects of precocious sperm entry on the egg of Nereis limbata. J. Exp. Zool., 112: 79-108. Ref_342 Mayer, A. G., 1908. The annual breeding-swarm of the Atlantic Palolo. Pap. Tortugas Lab., 1: 107-112. (Carnegie Inst., Wash., Publ. no. 102.). Ref_344 Morgan, T. H., and A. Tyler, 1930. The point of entrance of the spermatozoon in relation to the orientation of the embryo in eggs with spiral cleavage. Biol. Bull., 58: 59-73. Ref_345 Novikoff, A. B., 1939. Changes at the surface of Nereis limbata eggs after insemination. J. Exp. Biol., 16: 403-408. Ref_346 Pasteels, J., 1950. Mouvements localises et rythmiques de la membrane de fécondation chez des oeufs fécondés ou activés (Chaetopterus, Mactra, Nereis). Arch. Biol., 61: 197-220. Ref_347 Whitaker, D. M., 1931. On the rate of oxygen consumption by fertilized and unfertilized eggs. Iii. Nereis limbata. J. Gen. Physiol., 15: 191-200. Ref_348 Wilson, E. B., 1892. The cell-lineage of Nereis. A contribution to the cytogeny of the Annelid body. J. Morph., 6: 361-480. Ref_349 Wilson, E. B., 1898. Considerations on cell lineage and ancestral reminiscence. Ann. N. Y. Acad. Sci., 11: 1-27. Ref_350 Von Wistinchausen, C., 1891. Untersuchungen über die Entwicklung von Nereis dumerilfi. Ein Beitrag zur Entwicklungsgeschichte der Polychaeten. Mitt. Zool. Stat., Neapel, 10: 41-74. Ref_351 Woltereck, R., 1904a. Wurm"kopf"", Wurmrumpf, und Trochophora. Bemerkumgen \ Entwicklung und Ableitung der Anneliden. Zool. Ans., 28: 273-322. Ref_352 Woltereck, R., 1904b. Beiträge zur praktischen Analyse der Polygordius-Entwicklumg nach dem "Nordsee-" und dem "Mittelmeertypus". I. Der fur beide Typen gleichverlauiende Entwicklungsabschnitt: Vom Ei bis zum jüngsten Trochophora-Stadium. Arch. f. Endw., 18: 377-403. Ref_353 Woltereck, R., 1905. Zur Kopffrage der Anneliden. Verh. d. Deutsch Zool. Ges., 15: 154-186. Ref_354 Woodworth, W. Mcm., 1907. The Palolo worm, Eunice viridis (Gray). Bun. Mus. Comp. Zool., Harvard, 51: 1-21. Ref_356 Berg, W. E., 1950. Lytic effects of sperm extracts on the eggs of Mytilus edulis. Biol. Bull., 98: 128-138. Ref_357 Berg, W. E., and P. B. Kutsky, 1951. Physiological studies of differentiation in Mytilus edulis. I. The oxygen uptake of isolated blastomeres and polar lobes. Biol. Bull., 101: 47-61. Ref_359 Field, I. A., 1922. Biology and economic value of the sea mussel Mytilus edulis. Bull. U. S. Burl Fish., 38: 127-259. Ref_361 Matthews, A., 1913. Notes on the development of Mytilus edulis and Alcyonium digitatum in the Plymouth laboratory. J. Mar. Biol. Assoc., 9: 557-560. Ref_362 Meves, F., 1915. Über den Befruchtungsvorgang bei der Miesmuschel (Mytilus edulis L.). Arch. f. miter. Anat., 87: A, 2, pp. 47-62. Ref_364 Rattenbury, J. C., and W. E. Berg, 1954. Embryonic segregation during early development of Mytilus edulis. J. Morph., 95: 393-414. Ref_367 White, K. M., 1937. Mytilus. Liverpool Mar. Biol. Comm. Mem., vol. 31, pp. 1-117. Ref_368 Agassiz, A., 1874. Embryology of the Ctenophorae. Mem. Amer. Acad. Arts and Sci, 10: 356-398. Ref_369 Mayer, A. G., 1912. Ctenophores of the Atlantic coast of North America. Carn. Inst., Wash. Publ. 162. Ref_370 Gemmill, J. F., 1920. The development of the sea-anemones Metridium dianthus (Ellis) and Adamsia palliata (Bohad). Phil. Trans. Roy. Soc., London, ser. B, 209: 351-375. Ref_371 Mcmurrich, J. P., 1891. Contributions on the morphology of the Actinozoa. Ii. On the development of the Hexactiniae. J. Morph., 4: 303-330. Ref_372 Belding, D. L., 1911. The life history and growth of the quahaug (Venus mercenaria). Ann. Rep., Comm. Fish and Game, Massachusetts, 1910, pp. 18-128. Ref_373 Loosanoff, V. L., 1937a. Spawning of Venus mercenaria (L.). Ecology, 18: 506-515. Ref_374 Loosanoff, V. L., 1937b. Development of the primary gonad and sexual phases in Venus mercenaria Linnaeus. Biol. Bull., 72: 389-405. Ref_375 Loosanoff, V. L., 1937c. Seasonal gonadal changes of adult clams, Venus mercenaria (L.). Biol. Bull., 72: 406-416. Ref_376 Loosanoff, V. L., 1949. Method for supplying a laboratory with warm sea water in winter. Science, 110: 192-193. Ref_377 Loosanoff, V. L., and H. C. Davis, 1950. Conditioning V. mercenaria for spawning in winter and breeding its larvae in the laboratory. Biol. Bull., 98: 60-65. Ref_378 Loosanoff, V. L., W. S. Miller and P. B. Smith, 1951. Growth and setting of larvae of Venus mercenaria in relation to temperature. J. Mar. Res., 10: 59-81. Ref_380 Bequaert, J. C., 1943. The genus Littorina in the western Atlantic. Johnsonia, no. 7, pp. Ref_381 Delsman, H. C., 1914. Entwicklungsgeschichte von Littorina obtusata. Tijdschr. Nederl Dierkundige Vereeniging, ser. 2 13: 170-340. Ref_382 Hertling, H., and W. E. Ankel 1927. Bemerkungen über Laich und Jugendformen von Littorina und Lacuna. Wiss. Meeres. Komm. Unt. Deutsch. Meere, N. F., Abt. Helgoland,. Ref_384 Linke, O., 1935. Der Laiche von Littorina (Melaraphe) neritoides L. Zool. Anz., 112:. Ref_386 Hertling, H., 1928. Beobachtungen und Versuche an den Eiern von Littorina und Lacuna. Wiss. Meeres. Komm. Unt. Deutsch. Meere, N. F., Abt. Helgoland, 17 (2): 1-49. Ref_389 Ball, E. G., 1944. A blue chromoprotein found in the eggs of the goose-bamacle. J. Biol. Chem., 152: 627-634. Ref_390 Bigelow, M. A., 1902. The early development of Lepas. A study of cell-lineage and germ layers. Bull. Mus. Comp. Zool., Harvard, 40: 61-144. Ref_403 Broors, W. K., 1880. The development of the squid Loligo pealii (Lesueur). Anniv. Mem. Boston Soc. Nat. Hist., 1880, pp. 1-22. Ref_404 Drew, G. A., 1911. Sexual activities of the squid, Loligo pealii (Les.). I. Copulation, egglaying and fertilization. J. Morph., 22: 327-359. Ref_405 Drew, G. A., 1919. Sexual activities of the squid Loligo pealii (Les.). Ii. The spermatophore; its structure, ejaculation and formation. J. Morph., 32: 379-435. Ref_406 Hoadley, L., 1930. Polocyte formation and the cleavage of the polar body in Loligo and Chaetopterus. Biol. Bull., 58: 256-264. Ref_407 Korschelt, E., 1892. Beitrage zur Entwicklungsgeschichte der Cephalopoden. I. Die Entstehung des Darmkanals und Nervensystems in Beziehung zur Keimblatterfrage. Festschrift R. Leuckart, S. 347-373. Ref_408 Korschelt, E., 1936. Cephalopoden. In: Vergleichende Entwicklungsgeschichte der Tiere, Gustav Fischer, Jenz, Bd. 2, S. 968-1009. Ref_410 Naef, A., 1928. Die Cephalopoden, Bd. 2, Embryologie. Fauna und Flora des Golfes von Neapel, 35: 1-347. Ref_411 Portmann, A., 1926. Der embryonale Blutkreislauf und die Dotterresorption bei Loligo vulgaris. Zeitschr. f. Morph. u. Okol. d. Tiere, 5: 406-423. Ref_412 Portmann, A., and A. M. Bidder, 1928. Yolk-absorption in Loligo and the function of the embryonic liver and pancreas. Quart. J. Micr. Sci., 72: 301-324. Ref_413 Ranzi, S., 1931a. Duplicitas cruciata in embrioni di Cefalopodi. Pubbl. Staz. Zool., Napoli, 11: 86-103. Ref_414 Ranzi, S., 1931b. Sviluppo di parti isolate di embrioni di Cefalopodi. (Analisi sperimentale dell'embriogenesi.) Pubbl. Staz. Zool., Napoli, 11: 104-146. Ref_415 Ranzi, S., 1937. Ricerche sulfa fisiologia dell'embrione dei Ce&lopodi. Pont. Acad. Scient., Acta, 1: 43-49. Ref_416 Spek, J., 1934. Die bipolare Differenzierung des Cephalopoden- und des Prosobranchiereies. Arch. f. Entw., 131: 362-372. Ref_417 Watase, S., 1891. Studies on Cephalopods. I. Cleavage of the ovum. J. Morph., 4: 247-302. Ref_418 Williams, L. W., 1910. The anatomy of the common squid, Loligo pealii, Lesueur. E. J. Brill, Leiden, Holland, pp. 1-92. Ref_420 Beckwith, C. J., 1914. The genesis of the plasma-structure in the egg of Hydractinia echinata. J. Morph., 25: 189-251. Ref_426 Teissier, L., and G. Teissier, 1927. Les principales étapes du développement d Hydractinia echinata (Flem.). Bull. Soc. Zool. France, 52: 537-547. Ref_427 Lang, A., 1884. Die Polycladen (Seeplanarien) des Golfes von Neapel und der angrenzenden Meeresabschnitte. Fauna u. Flora d. Golfes von Neapel, 11: 1-688. Ref_428 Macbride, E. W., 1914. Text-Book of Embryology. Vol. I. Invertebrata. Macmillan and Co., Ltd., London, pp. 102-117. Ref_429 Surface, F. M., 1907. The early development of a polyclad, Planocera inquilina Wh. Proc. Acad. Nat. Sci., Phila., 59: 514-559. Ref_430 Berrill, N. J., 1950. Growth and form in calyptoblastic hydroids. Ii. Polymorphism within the Campanularidae. J. Morph., 87: 1-26. Ref_432 Hargitt, G. T., 1913. Germ cells of coelenterates. I. Campasularia flexuosa. J. Morph., 24: 383-413. Ref_434 Chambers, R., 1933. The manner of sperm entry in various marine ova. J. Exp. Biol., 10: 130 141. Ref_435 Coe, W. R., 1895. On the anatomy of a species of Nemertean (Cerebratulus lacteus Verrill), with remarks on certain other species. Trans. Conn. Acad. Arts and Sci, 9: 479-514. Ref_436 Coe, W. R., 1899a. The maturation and fertilization of the egg of Cerebratulus. Zool. Jahrb. abt. Anat. u. Ontog., 12: 425-476. Ref_437 Coe, W. R., 1899b. On the development of the pilidium of certain nemerteans. Trans. Conn. Acad. Arts and Sci., 10: 235-262. Ref_438 Coe, W. R., 1937. Methods for the laboratory culture of nemerteans. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 162-165. Ref_439 Coe, W. R., 1943. Biology of the nemerteans of the Atlantic Coast of North America. Trans. Conn. Acad. Arts and Sci., 35: 129-327. Ref_440 Hörstadius, S., 1937. Experiments on determination in the early development of Cerebratulus lacteus. Biol. Bull., 73: 317-342. Ref_441 Macbride, E. W., 1914. Text-Book of Embryology. Vol. I. Invertebrata. Macmillan and Co., Ltd., London, pp. 118-127. Ref_442 Wilson, C. B., 1900. The habits and early development of Cerebratulus lacteus (Verrill). A contribution to physiological morphology. Quart. J. Micr. Sci, 43: 97-198. Ref_443 Wilson, E. B., 1903. Experiments on cleavage and localization in the nemertine-egg. Arch. f. Entw. 16: 411-460. Ref_444 Yatsu, N., 1904. Experiments on the development of egg fragments in Cerebratulus. Biol. Bull., 6: 123-136. Ref_445 Yatsu, N., 1909. Observations on oökinesis in Cerebratulus lacteus, Verrill. J. Morph., 20: 353-401. Ref_446 Yatsu, N., 1910a. Experiments on cleavage in the egg of Cerebratulus. J. Coll. Sci., Tokyo, 27: no. 10, pp. 1-19. Ref_447 Yatsu, N., 1910b. Experiments on germinal localization in the egg of Cerebratulus. J. Coll. Sci., Tokyo, 27: no. 17, pp. 1-36. Ref_448 Zeleny, C., 1904. Experiments on the localization of developmental factors in the nemertineegg. J. Exp. Zool., 1: 293-329. Ref_449 Ankel, W. E., 1929. Über die Bildung der Eikapsel bei Nassa-Arten. Verh. d. Deutsch. Zool. Ges., 33: 219-230. Ref_450 Butros, J. M., 1956. Simultaneous effects of metabolic inhibitors on the viscosity, surface rigidity and cleavage in Ilyanassa eggs. J. Cell. Comp. Physiol. 47: 341-356. Ref_451 Clement, A. C., 1935. The formation of giant polar bodies in centrifuged eggs of Ilyanassa. Biol. Bull., 69: 403-414. Ref_452 Clement, A. C., 1952. Experimental studies on germinal localization in Ilyanassa. I. The role of the polar lobe in determination of the cleavage pattern and its influence in later development. J. Exp. Zool., 121: 593-625. Ref_453 Clement, A. C., 1956. Experimental studies on germinal localization in Ilyanassa. Ii. The development of isolated blastomeres. J. Exp. Zool., 132: 427 116. -. Ref_454 Clement, A. C., and F. E. Lehmann, 1956. Über des Verteilungsmuster von Mitochondrien und Lipoidtropfen während der Furchung des Eies von Ilyanassa obsoleta ( Mollusca, Prosobranchia). Naturwiss., 43: 478-479. Ref_455 Crampton H. E., Jr., 1896. Experimental studies on gasteropod development. Arch. f. Entw., 3: 1-19. Ref_456 Dan, K., and J. C. Dan, 1942. Behavior of the cell surface during cleavage. Iv. Polar lobe formation and cleavage of the eggs of Ilyanassa obsoleta Say. Cytologia, 12: 246-261. Ref_458 Morgan, T. H., 1933. The formation of the antipolar lobe in Ilyanassa. J. Exp. Zool., 64: 433-467. Ref_459 Morgan, T. H., 1935a. Centrifuging the eggs of Ilyanassa in reverse. Biol. Bull., 68: 268279. Ref_460 Morgan, T. H., 1935b. The separation of the egg of Ilyanassa into two parts by centrifuging. Biol. Bull., 68: 280-295. Ref_461 Morgan, T. H., 1935c. The rhythmic changes in form of the isolated antipolar lobe of Ilyanassa. Biol. Bull., 68: 296-299. Ref_462 Morgan, T. H., 1936. Further experiments on the formation of the antipolar lobe of Ilyanassa. J. Exp. Zool., 74: 381-425. Ref_463 Morgan, T. H., 1937. The behavior of the maturation spindles in polar fragments of eggs of Ilyanassa obtained by centrifuging. Biol. Bull., 72: 88-98. Ref_464 Pelseneer, P., 1911. Recherches sur l'embryologie des Gastropodes. Mem. Acad. Roy., Belgique, ser. 2, Coll. In-4•, 3: 1-167. Ref_465 Tyler, A., 1946. Rapid slide-making method for preparation of eggs, protozoa, etc. Coll. Net, 19:50. Ref_467 Clark, H. L., 1899. The Synaptas of the New England coast. Bull. U. S. Burl Fish., 19: 21-31. Ref_468 Clark H. L., 1907. The apodous holothurians. A monograph of the Synaptidae and the Molpadiidae. Smithsonian Contr. to Knowledge, 35: no. 1723 pp. 1-231. Ref_470 Costello, D. P., 1946. The swimming of Leptosynapta. Biol. Bull., 90: 93-96. Ref_471 Runnström, S., 1927. Über die Entwicklung von Leptosynapta inhaerens (O. Fr. Müller). Bergens Mus. Arb., 1927, Naturv. rekke, Nr. 1, pp. 1-80. Ref_472 Brooks, W. K., and F. H. Herrick, 1892. The embryology and metamorphosis of the Macroura. Mem. Nat. Acad. Sci., 5: 325-574. Ref_473 Bumpus, H. C., 1898a. The breeding of animals at Woods Holl during the month of May, 1898. Science, 8: 58-61. Ref_474 Bumpus, H. C., 1898b. The breeding of animals at Woods Holl during the months of June, July and August. Science, 8: 850-858. Ref_476 Reichenbach, H., 1886. Studien zur Entwicklungsgeschichte des Flusskrebses. Abh. Senckenberg. Naturforsch. Ges., 14: 1-137. Ref_477 Thompson M. T., 1899. The breeding of animals at Woods Hole during the month of September, 1898. Science, 9: 581-583. Ref_478 Colwin, A. L., L. H. Colwin and D. E. Philpott 1956a. Sperm entry in Hydroides hexagonus (Annelida) and Saccoglossus kowalevski (Enteropneusta). Biol. Bull., 111: 289. Ref_479 Colwin, L. H., A. L. Colwin and D. E. Philpott, 1956b. Electron microscope studies of the egg surfaces and membranes of Hydroides hexagonus (Annelida) and Saccoglossus kowalevskii (Enteropneusta). Biol. Bull., 111: 289-290. Ref_480 Conn, H. W., 1884. Development of Serpula. Zool. Ans., 7: 669-672. Ref_482 Grave, B. H., 1937. Hydroides hexagonus. In: Culture Methods for Invertebrate Animals edit. by Galtsoff et al., Comstock, Ithaca, pp. 185-187. Ref_483 Hargitt, C. W., 1910. Observations on the spawning habits of Hydroides dianthus. Amer. Nat., 44: 376-378. Ref_484 Hatschek, B., 1886. Entwicklung der Trochophora von Eupomatus uncinatus, Philippi (Serpula uncinata). Arbeit. Zool. Inst. Wien, 6: 121-148. Ref_485 Shearer, C., 1911. On the development and structure of the trochophore of Hydroides uncinatus (Eupomatus). Quart. J. Micr. Sci., 56: 543-590. Ref_486 Wilson, E. B., 1890. The origin of the mesoblast-bands in annelids. J. Morph., 4: 205-219. Ref_487 Zeleny, C., 1905a. The rearing of serpulid larvae with notes on the behavior of the young animals. Biol. Bull., 8: 308-312. Ref_488 Zeleny, C., 1905b. Compensatory regulation. J. Exp. Zool., 2: 1-102. Ref_489 Zeleny, C., 1911. Experiments on the control of asymmetry in the development of the Serpulid, Hydroides dianthus. J. Morph., 22: 927-944. Ref_490 Allen, M. J., 1951. Observations on living developmental stages of the polychaete, Diopatra cuprea (Bosc). Anat. Rec., 111: 134. Ref_491 Allen, M. J., 1953. Development of the polychaete, Diopatra cuprea (Bosc). Anat. Rec., 117: 572-573. Ref_492 Andrews, E. A., 1891a. Report upon the Annelida Polychaeta of Beaufort, North Carolina. Proc. U. 5. Nat. Mus., 14: 277-302. Ref_493 Andrews, E. A., 1891b. Reproductive organs of Diopatra. J. Morph., 5: 113-124. Ref_495 Hartman, O., 1945. The marine annelids of North Carolina. Duke Univ. Mar. Station, Bull. no. 2. Ref_496 Hartman, O., 1951. The littoral marine annelids of the Gulf of Mexico. Publ. Inst. Mar. Sci., Univ. of Texas 2: 1-124. Ref_498 Monro, C. C. A., 1924. On the post-larval stage in Diopatra cuprea, Bosc, a Polychaetous Annelid of the family Eunicidae. Ann. Mag. Nat. Hist. ser. 9, 14: 193-199. Ref_499 Renaud, J. c., 1956. A report on some polychaetous annelids from the Miami-Bimini area. Amer. Mus. Novitates, No. 1812. Ref_500 Sumner, F. B., R. C. Osburn and L. J. Cole, 1911. A biological survey of the waters of Woods Hole and vicinity. Part 1. Bull. U. S. Burl Fisheries, 31. 1-544. Ref_504 Clark, E., and J. M. Moulton, 1949. Embryological notes on Menidia. Copeia, 1949, no. 2, pp. 152-154. Ref_505 Kendall, W. C., 1901. Notes on the silversides of the genus Menidia of the east coast of the United States, with descriptions of two new subspecies. Rep. of the Commissioner, U. S. Comm. of Fish & Fisheries, 27: 241-267. Ref_506 Kuntz, A., and L. Radcliffe, 1917. Notes on the embryology and larval development of twelve teleostean fishes. Bull. U. S. Burl Fish., 35: 87-134. Ref_507 Nichols, J. T., and C. M. Breder, Jr., 1927. The marine fishes of New York and southern New England. Zoologica, 9: 1-192. Ref_508 Agassiz, A., 1877. North American starfishes. I. Embryology of the starfish. Mem. Mus. Comp. Zool., Harvard, 5: no. 1, pp. 1-83. First published in 1864. Ref_509 Chadwick, H. C., 1923. Asterias. Liverpool Mar. Biol. Comm. Mem., no. 25, pp. 1-63. Ref_510 Chambers, R., 1930. The manner of sperm entry in the starfish egg. Biol. Bull., 58: 344-369. Ref_511 Chambers, R., and E. L. Chambers, 1949. Nuclear and cytoplasmic interrelations in the fertilization of the Asterias egg. Biol. Bull., 96: 270-282. Ref_512 Colwin, L. H., and A. L. Colwin, 1955. Some factors related to sperm entry in two species of Asterias. Biol. Bull., 109: 357. Ref_514 Costello, D. P., 1935. Fertilization membranes of centrifuged Asterias eggs. I. The effects of centrifuging before fertilization. Physiol. Zool., 8: 65-72. Ref_515 Delage, Y., 1904. Élevage des larves parthenogen~etiques d'Asterias glacialis. Arch. de Zool. expert, 4e ser., 2: 27-42. Ref_516 Fol, H., 1879. Recherches sur la fecondation et le commencement de l'henogenie chez divers animaux. Mem. Soc. Phys. et Hist. Nat., Geneve, 26: 12-397. Ref_517 Fry, H. J., 1937. Asterias forbesi. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 547-550. Ref_518 Gemmill, J. F., 1914. Vii. The development and certain points in the adult structure of the starfish Asterias rubens, L. Phil. Trans. Roy. Soc., London, ser. B, 205: 213-294. Ref_519 Goto, S., 1898. The metamorphosis of Asterias pallida, with special reference to the fate of the body cavities. J. Coll. Sci., Imp. Univ., Japan, 10: 239-278. Ref_521 Korschelt, E., and K. Heider, 1936. Vergleichende Entwicklungsgeschichte der Tiere. Vol. 1. G. Fischer, Jena. Ref_522 Larsen, E. J., 1937. The laboratory culture of the larvae of Asterias forbesi. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 550-553. Ref_523 Lillie, R. S., 1941. Further experiments on artificial parthenogenesis in starfish eggs, with a review. Physiol. Zool., 14: 239-267. Ref_525 Newman, H. H., 1925. An experimental analysis of asymmetry in the starfish, Patiria miniata. Biol. Bull., 49: 111-138. Ref_526 Joseph, H., 1925. Zur Morphologie und Entwicklungsgeschichte von Haleremita und Gonionemus. Zeitschr. f. wiss. Zool., 125: 374-434. Ref_527 Murbach L., 1895. Preliminary note on the life-history of Gonionemus. J. Morph., 11: 493-496. Ref_528 Perkins, Y. F., 1902. The development of Gonionema murbachii. Proc. Acad. Nat. Sci., Philadelphia, 54: 750-790. Ref_529 Rugh R., 1929. Egg laying habits of Gonionemus murbachii in relation to light. Biol. Bull., 57: 261-266. Ref_533 Wulfert, J., 1902. Die Embryonalentwicklung von Gonothyraea loveni Allm. Zeitschr. f. wiss. Zool., 71: 296 327. Ref_534 Berrill, N. J., 1931. The natural history of Bulla hydatis Linn. J. Mar. Biol. Assoc., 17: 567-571. Ref_535 Smallwood, M., 1901. The centrosome in the maturation and fertilization of Bulla solitaria. Biol. Bull., 2: 145-154. Ref_536 Smallwood, W. M., 1904a. Natural history of Haminea solitaria Say. Amer. Nat., 38: 207-225. Ref_537 Smallwood, W. M., 1904b. The maturation, fertilization, and early cleavage of Haminea solitaria (Say). Bull. Mus. Comp. Zool., Harvard, 45: 259-318. Ref_539 Mcintosh W. C., 1900 1923. A monograph of the British Annelids, Pt. Ii. Polychaeta. Dulau & Co., Ltd., London. (Eight volumes.). Ref_542 Sars, M., 1845. Zur Entwicklung der Anneliden. Arch. f. Naturgesch., 11 Jahrg., 1: 11-19. Ref_543 Thorson, G., 1946. Reproduction and larval development of Danish marine bottom invertebrates, with special reference to the planktonic larvae in the Sound (0resund). Medd. f. Komm. Danmarks Fiskeri. og Havunders., Ser. Plankton, 4: (Nr. 1) 1-523. Ref_545 Clark, H. L., 1902. The echinoderms of the Woods Hole region. Bull. U. S. Burl Fish., 22: 545-574. Ref_547 Masterman, A. T., 1902. The early development of Cribrella oculata (Forbes), with remarks on echinoderm development. Trans. Roy. Soc., Edinburgh, 40: 373-418. Ref_550 Agassiz, A., and C. O. Whitman, 1889. The development of osseous fishes. Ii. The preembryonic stages of development. Part First. The history of the egg from fertilization to cleavage. Mem. Mus. Comp. Zool., Harvard, 14: no. 2, part 2, pp. 1-40. Ref_557 Nicholas, J. S., 1927. The application of experimental methods to the study of developing Fundulus embryos. Proc. Nat. acad. Sci., 13: 695-698. Ref_558 Nicholas, J. S., and J. M. Oppenheimer, 1942. Regulation and reconstitution in Fundulus. J. Exp. Zool., 90: 127-157. Ref_559 Oppenheimer, J. M., 1937. The normal stages of Fundulus heteroclitus. Anat. Rec., 68: 1-15. Ref_561 Solberg, A. N., 1938. The development of a bony fish. Prog. Fish. Cult., no. 40, pp. 1-19. Ref_563 Trinkaus, J. P., and J. W. Drake, 1956. Exogenous control of morphogenesis in isolated Fundulus blastoderms by nutrient chemical factors. J. Exp. Zool., 132: 311-347. Ref_564 Wilson, H. V., 1889. The embryology of the sea bass (Serranus atrarius). Bull. U. S. Fish Comm., 9: 209-278. Ref_566 Hargitt, C. W., 1904. The medusae of the Woods Hole region. Bull. Burl Fish., 24: 21-79. Ref_567 Allman, J. G., 1871. A monograph of the gymnoblastic or tubularian hydroids. London, The Ray Society. Ref_570 Hargitt, C. W., 1889. Origin of sex-cells in Eudendrium. Proc. Amer. Assoc. Adv. Sci., 1889. Ref_571 Hargitt, C. W., 1904. The early development of Eudendrium. Zool. Jahrb. abt. Anat. u. Ontog., 20: 257-276. Ref_573 Just, E. E., 1939. Basic Methods for Experiments on Eggs of Marine Animals. P. Blakiston's Son and Co., Inc., Philadelphia, pp. 33-34. Ref_577 Macginitie, G. E., 1938. Movements and mating habits of the sand crab, Emerita analoga. Amer. Midl. Nat., 19: 471-481. Ref_578 Matthews, D. C., 1956. The origin of the spermatophoric mass of the sand crab, Hippa pacifica. Quart. J. Micr. Sci., 97: 257-268. Ref_579 Bonnevie, K., 1907. Untersuchungen über Keimzellen. Ii. Physiologische Polyspermie bei Bryozoen. Jenaische Zeitschr. f. Naturw., 35: 567-598. Ref_580 Just, E. E., 1934. Fertilization in Membranipora pilosa. Carnegie Inst. Year Book, 33: 268-270. Ref_581 Kupelweiser, H., 1905. Untersuchungen über den feineren Bau und die Metamorphose des Cyphonautes. Zoologica, 19: Hf. 47, pp. 1-50. Ref_583 Prouho, H., 1892. Contribution a l'histoire des Bryozoaires. Arch. de Zool. Exp., 20: 557656. Ref_584 Silén, L., 1944. The main features of the development of the ovum, embryo and ooecium in the ooeciferous Bryozoa Gymnolaemata. Arkiv f. Zool., K. Svenska Vetenskap., 35A: no. 17, pp. 1-34. Ref_585 Allen, C. M., 1900. A contribution to the development of Parypha crocea. Biol. Bull., 1: 291-315. Ref_586 Benoit, P., 1925. L'ovogenese et les premiers stades du developpement chez la Myriothele et chez la Tubulaire. Arch. de Zool. Exp., 64: 85-326. Ref_587 Berrill, N. J., 1952. Growth and form in gymnoblastic hydroids. V. Growth cycle in Tubularia. J. Morph., 90: 583-601. Ref_589 Hargitt, G. T., 1909. Maturation, fertilization, and segmentation of Pennaria tiarella (Ayres) and of Tubularia crocea (Ag.). Bull. Mus. Comp. Zool., Harvard, 53: 162-212. Ref_592 Lowe, E., 1926. The embryology of Tubularia larynx (Allm.). Quart. J. Micr. Sci., 70: 599-627. Ref_596 Child, C. M., 1950. Differential modification of sand-dollar development in relation to temperature. Physiol. Zool., 23: 140-168. Ref_599 Just, E. E., 1919a. The fertilization reaction in Echinarachnius parma I. Cortical response of the egg to insemination. Biol. Bull., 36: 1-10. Ref_600 Just, E. E., 1919b. Ii. The role of fertilizin in straight and cross fertilization. Biol. Bull., 36: 11-38. Ref_601 Just, E. E., 1919c. Iii. The nature of the activation of the egg by butyric acid. Biol. Bull., 36: 39-53. Ref_602 Just, E. E., 1920. Iv. A further analysis of the nature of butyric acid activation. Biol. Bull., 39: 280-305. Ref_603 Just, E. E., 1922. V. The existence in the inseminated egg of a period of special susceptibility to hypotonic sea-water. Amer. J. Physiol., 61: 516-527. Ref_604 Just, E. E., 1923a. Vi. The necessity of the egg cortex for fertilization. Biol. Bull., 44: 1-9. Ref_605 Just, E. E., 1923b. Vii. The inhibitory action of blood. Biol. Bull., 44: 10-16. Ref_606 Just, E. E., 1923c. Viii. Fertilization in dilute sea-water. Biol. Bull., 44: 17-21. Ref_608 Pease, D. C., 1941. Echinoderm bilateral determination in chemical concentration gradients. I. The effects of cyanide, ferricyanide, iodoacetate, picrate, dinitrophenol, urethane, iodine, malonate, etc. J. Exp. Zool., 86: 381-404. Ref_609 Pease, D. C., 1942a. Echinoderm bilateral determination in chemical concentration gradients. Ii. The effects of azide, pilocarpine, pyocyanine, diamine, cysteine, glutathione, and lithium. J. Exp. Zool. 89: 329-345. Ref_610 Pease, D. C., 1942b. Echinoderm bilateral determination in chemical concentration gradients. Iii. The effects of carbon monoxide and other gases. J. Exp. Zool., 89: 347-356. Ref_611 Costello, D. P., 1934. The hyaline zone of the centrifuged egg of Cumingia. Biol. Bull., 66: 257-263. Ref_612 Grave, B. H., 1927a. An analysis of the spawning habits and spawning stimuli of Cumingia tellinoides. Biol. Bull., 52: 418-435. Ref_613 Grave, B. H., 1927b. The natural history of Cumingia tellinoides. Biol. Bull., 53: 208-219. Ref_614 Heilbrunn, L. V., 1920. Studies in artificial parthenogenesis. Iii. Cortical change and the initiation of maturation in the egg of Cumingia. Biol. Bull., 38: 317-339. Ref_616 Morgan, T. H., 1910. Cytological studies of centrifuged eggs. J. Exp. Zool., 9: 593-655. Ref_617 Whitaker, D. M., 1931. On the rate of oxygen consumption by fertilized and unfertilized eggs. Ii. Cumingia tellinoides. J. Gen. Physiol., 15: 183-190. Ref_618 Whitaker, D. M., 1939. The effect of fertilization on the rate of staining of Cumingia eggs. Growth, 3: 153-158. Ref_619 Barrois, J., 1877. Recherches sur l'embryologie des Bryozoaires. Travaux de l'Inst. Zool. de Lille et de la Station Maritime de Wimereux. Monograph. Ref_620 Bobg, F., 1926. Studies on recent cyclostomatous Bryozoa. Zool. Bidrag Fran Uppsala, 10: 181-504. Ref_621 Harmer, S. F., 1893. On the occurrence of embryonic fission in cyclostomatous Polyzoa. Quart. J. Micr. Sci., 34: 199-241. Ref_622 Robertson, A., 1903. Embryology and embryonic fission in the genus Crisia. Univ. Calif. Pub. Zool., 1: 115-156. Ref_623 Rogick, M. D., and H. Croasdale, 1949. Studies on marine bryozoa, Iii. Woods Hole region bryozoa associated with algae. Biol. Bull., 96: 32-69. Ref_624 Sit-En, L., 1944. The anatomy of Labiostomella Gisleni . . . with special regard to the embryo chambers of the different groups of Bryozoa and to the origin and development of the bryozoan zoarium. Kungl. Svensak Vetensk. Handlingar, Tredje ser., 21: no. 6, pp. 3-111. Ref_626 Coe, W. R., 1936. Sexual phases in Crepidula. J. Exp. Zool., 72: 455-477. Ref_627 Coe, W. R., 1938. Conditions influencing change of sex in mollusks of the genus Crepidula. J. Exp. Zool., 77: 401-424. Ref_628 Coe, W. R., 1948. Nutrition and sexuality in protandric gastropods of the genus Crepidula. Biol. Bull., 94: 158-160. Ref_629 Conklin, E. G., 1897. The embryology of Crepidula, a contribution to the cell lineage and early development of some marine gasteropods. J. Morph., 13: 1-226. Ref_630 Conklin, E. G., 1902. Karyokinesis and Cytokinesis in the maturation, fertilization and cleavage of Crepidula and other Gasteropoda. I. Karyokinesis. Ii. Cytokinesis. J. Acad. Nat. Sci., Philadelphia, ser. 2, 12: 1-121. Ref_631 Conklin, E. G., 1937. The genus Crepidula. In: Culture Methods for Invertebrate Animals edit. by Galtsoff et al., Comstock Ithaca, pp. 531-532. Ref_632 Gould, H. N., 1950. Culturing Crepidula plana in running sea water. Science, 111: 602-603. Ref_633 Moritz, C. E., 1938. The anatomy of the gasteropod Crepidula adunca Sowerby. Univ. California Publ. Zool., 43: 83-92. Ref_634 Moritz, C. E., 1939. Organogenesis in the gasteropod Crepidula adunca Sowerby. Univ. California Publ. Zool., 43: 217-248. Ref_635 Berrill, N. J., 1949. Growth and form in gymnoblastic hydroids. I. Polymorphic development in Bougainvillia and Aselomaris. J. Morph., 84: 1-30. Ref_636 Gerd, W., 1892. Zur Frage über die Keimblätterbildung bei den Hydromedusen. Zool. Anz., 15: 312-316. Ref_640 Corrêa, D., 1948. A embriologia de Bugula flabellata. Universidade de Sao Paulo Boll a. Fact Fill, Ciên., e Let., Zool., 13: 7-73. Ref_641 Grave, B. H., 1930. The natural history of Bugula flabellata at Woods Hole, Massachusetts, including the behavior and attachment of the larva. J. Morph., 49: 355-383. Ref_642 Grave, B. H., 1937. Bugula flabellata and B. turrita. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 178-179. Ref_643 Hasper, M., 1912. On a method of rearing larvae of Polyzoa. J. Mar. Biol. Assoc., 9: 435-436. Ref_644 Lynch, W. F., 1947. The behavior and metamorphosis of the larva of Bugula neritina (Linnaeus): Experimental modification of the length of the free-swimming period and the responses of the larvae to light and gravity. Biol. Bull., 92: 115-150. Ref_645 Lynch, W. F., 1952. Factors influencing metamorphosis of Bugula larvae. Biol. Bull., 103: 369-383. Ref_646 Lynch, W. F., 1955. Synergism and antagonism in the induction of metamorphosis of Bugula larvae by neutral red dye. Biol. Bull., 109: 82-98. Ref_647 Mcdougall, K. D., 1943. Sessile marine invertebrates of Beaufort, North Carolina. A study of settlement, growth, and seasonal fluctuations among pile-dwelling organisms. Ecol. Monog., 13: 321-374. Ref_648 Mawatari, S., 1951. The natural history of a common fouling bryozoan Bugula neritina (L.). Misc. Reps. Res. Inst. Natural Resources, Nos. 19-21, Keita Shibata Memorial Numbers, Feb., 1951, pp. 47-54. Ref_649 Miller, M. A., 1946. Toxic effects of copper on attachment and growth of Bugula neritina. Biol. Bull., 90: 122-140. Ref_650 Vigelius, W. J., 1886. Zur Ontogenie der mariner Bryozoen. Mitt. Zool. Stat., Neapel, 6: 499-541. Ref_651 Vigelius, W. J., 1888. Zur Ontogenie der mariner Bryozoen. Mitt. Zool. Stat., Neapel, 8: 374-376. Ref_652 Conklin, E. G., 1907. The embryology of Fulgar: A study of the influence of yolk on development. Proc. Acad. Nat. Sci, Philadelphia, 59: 320-359. Ref_653 Conklin E. G., 1912. Cell size and nuclear size. J. Exp. Zool., 12: 1-98. Ref_654 Johnson C. W., 1903. Some notes on the genus Fulgur. The Nautilus, 17: 73-75. Ref_656 Mcmurrich, J. P., 1896. The yolk-lobe and the centrosome of Fulgar carica. Anat. Anz 12: 534-539. Ref_657 Grave, B. H., 1922. An analysis of the spawning habits and spawning stimuli of Chaetopleura apiculata (Say). Biol. Bull., 42: 234-256. Ref_658 Grave, B. H., 1932. Embryology and life history of Chaetopleura apiculata. J. Morph., 54: 153-160. Ref_659 Grave, B. H., 1937. Chaetopleura apiculata. In: Culture Methods for Invertebrate Animals, edit. by Galtsoff et al., Comstock, Ithaca, pp. 519-520. Ref_660 Heath, H., 1899. The development of Ischnochiton. Zool. Jahrb., abt. Anat. Ontog. Thiere, 12: 567-656. Ref_661 Kowalevsky, A. O., 1879. Ueber die Entwickelung der Chitonen. Zool. Anz., 2: 469-473. Ref_662 Kowalevsky, A. O., 1882. Weitere Sudien [sic] uber die Entwickelung der Chitonen. Zool. Anz., 5: 307-310. Ref_663 Kowalevsky, M. A.; 1883. Embryogenie du Chiton polii (Philippi) avec quelques remarques sur le developpement des autres Chitons. Ann. Mus. Hist. Nat., Marseilles, 1: (Mem. 5) pp. 1-46. Ref_664 Loven, S. 1856. Ueber die Entwickelung von Chiton. Arch. f. Naturgesch., 22 Jahrg., 1: 206-210. Ref_665 Metcalf, M. M., 1893. Contributions to the embryology of Chiton. Stud. Biol. Lab., Johns Hopkins Univ., 5: 249-267. Ref_666 Goldstein, L., 1953. A study of the mechanism of activation and nuclear breakdown in the Chaetopterus egg. Biol. Bull., 105: 87-102. Ref_667 Henley, C., And D. P. Costell, 1957. The effects of x-irradiation on the fertilized eggs of the annelid, Chaetopterus. Biol. Bull., 112: 184-195. Ref_669 Lillie, F. R., 1902. Differentiation without cleavage in the egg of the annelid Chaetopterus pergamentaceus. Arch. f. Entw., 14: 477-499. Ref_670 Lillie, F. R., 1906. Observations and experiments concerning the elementary phenomena of embryonic development in Chaetopterus. J. Exp. Zool., 3: 153-268. Ref_672 Pasteels, J., 1935. Recherches sur le determinisme de ['entree en maturation de l'oeuf chez divers Invertebres marine. Arch. Biol., 46: 229-262. Ref_674 Titlebaum, A., 1928. Artificial production of Janus embryos of Chaetopterus. Proc. Nat. Acad. Sci., 14: 245-247. Ref_675 Tyler, A., 1930. Experimental production of double embryos in annelids and mollusks. J. Exp. Zool., 57: 347-407. Ref_676 Whitaker D. M., 1933. On the rate of oxygen consumption by fertilized and unfertilized eggs. Iv. Chaetopterus and Arbacia punctulata. J. Gen. Physiol., 16: 4/5-495. Ref_677 Wilson, E. B., 1882. Observations on the early developmental stages of some polychaetous Annelides. Stud. Biol. Lab., Johns Hopkins Univ., 2: 271-299. Ref_678 Wilson, E. B., 1929. The development of egg-fragments in annelids. Arch. f. Entw., 117: 179-210. Ref_679 Berg, W. E., 1956. Cytochrome oxidase in anterior and posterior blastomeres of Ciona intestinalis. Biol. Bull., 110: 1-7. Ref_684 Berrill, N. J., 1947. The development and growth of Ciona. J. Mar. Biol. Assoc., 26: 616-625. Ref_685 Carlisle, D. B., 1951. On the hormonal and neural control of the release of gametes in ascidians. J. Exp. Biol., 28: 463-472. Ref_686 Castle, W. E., 1896. The early development of Ciona intestinalis, Flemming (L.). Bull. Mus. Comp. Zool., Harvard, 27: 201-280. Ref_688 Duesberg, J., 1915. Recherches cytologiques sur la fecondation des Ascidiens et sur leur developpement. Contrib. to Embryol., 3: 33-70. (Carnegie Inst., Wash., Publ. no. 223.). Ref_689 Harvey, L. A., 1927. The history of the cytoplasmic inclusions of the egg of Ciona intestinalis (L.) during oogenesis and fertilisation. Proc. Roy. Soc., London, ser. B, 101: 136-162. Ref_690 Just, E. E., 1934a. On the rearing of Ciona intestinalis under laboratory conditions to sexual maturity. Carnegie Inst., Wash., Year Book, 33: 270. Ref_691 Just, E. E., 1934b. Zoological researches. Carnegie Inst., Wash., Year Book, 34: 280-284. Ref_693 Morgan, T. H., 1945. The conditions that lead to normal or abnormal development of Ciona. Biol. Bull., 88: 50-62. Ref_695 Willey, A., 1893. Studies on the Protochordata. I. On the origin of the branchial stigmata, praeoral lobe, endostyle, atrial cavities etc., in Ciona intestinalis, Linn., with remarks on Clavelina lepadiformis. Quart. J. Micr. Sci., 34: 317-360. Ref_696 Zeijthen, E., 1955. Mitotic respiratory rhythms in single eggs of Psammechinus miliaris and of Ciona intestinalis. Biol. Bull., 108: 366-385. Ref_697 Bookhout, C. G., And E. C. Hoxn, 1949. The development of Axiothella mucosa (Andrews). J. Morph., 84: 145-183. Ref_698 Burbanck, W. D., M. E. Pierce And G. C. Whiteley, Jr., 1956. A study of the bottom fauna of Rand's Harbor, Massachusetts: An application of the ecotone concept. Ecol. Monog., 26: 213-243. Ref_701 Harm, K., 1902. Die Entwicklungsgeschichte von Clava squamata. Zeifschr. f. wiss. Zool., 73: 115-166. Ref_702 Hargitt, C. W., 1906. The organization and early development of Clava leptostyla Ag. Biol. Bull., 10: 207-232. Ref_703 Hargitt, C. W., 1911. Some problems of coelenterate ontogeny. J. Morph., 22: 493-549. Ref_704 Hargitt G. T., 1916. Germ cells of coelenterates. Ii. Clava leptostyla. J. Morph., 27: 85-97. Ref_705 Hargitt, G. T., 1919. Germ cells of coelenterates. Vi. General considerations, discussion, conclusions. J. Morph., 33: 1-60. Ref_706 Hyman, L. H., 1940. The Invertebrates: Protozoa through Ctenophora. Mcgraw-Hill Book Co., New York. Ref_707 Kemp N. E., 1952. Regeneration in isolated and fused pieces of Clava leptostyla. Biol. Bull., 102: 141-148. Ref_708 Kühn A., 1910. Die Entwicklung der Geschlechtsindividuen der Hydromedusen. Zool. Jahr. abt. Anat. u. Ontog. der Tiere, 30: 43-174. Ref_710 Mead, A. D., 1898. The breeding of animals at Woods Holl during the month of April, 1898. Science, 7:. Ref_711 Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition). Doi:http://dx.doi.org/10.5962/bhl.title.1020 Ref_712 Armstrong, P.B. and J.S. Child. 1965. Stages in the normal development of Fundulus heteroclitus. Biol. Bull. 128:143-153. Ref_713 Sekiguchi, K., Y. Yamamichi, Y.Seshimo, and H. Sugita. 1988. Chap. VI (pp133-181) in Biology of Horseshoe Crabs (K. Sekiguchi, Ed.), Science House Co. Ltd., Tokyo. Ref_714 Fitz, Jr., E.S., and F.C. Daiber. 1963. An introduction to the biology of Raja eglanteria Bosc 1802 and Raja erinacea Mitchill 1825 as they occur in Delaware Bay. Bull. Bingham Oceanographic Collection 18:69-97. Ref_715 Richards, S.W., D. Merriman, and L.H. Calhoun. 1963. Studies on the marine resources of Southern new England IX. The biology of the Little Skate, Raja erinacea Mitchill. Bull. Bingham Oceanographic Collection 18:5-67. Ref_716 Ryder, J.A. 1886. On the earlier stages of cleavage of the blastodisk of Raja erinacea Fisheries Bull. 6:1887-1888. Ref_717 Harvey, E. B. 1956. The American Arbacia and Other Sea Urchins. Princeton University Press, Princeton, NJ Ref_718 Stephens, R.E. 1972. Studies on the development of the sea urchin Strongylocentrotus drobachiensis. I. Ecology and normal development. Biol. Bull. 142:132-144.