284 



Ryberg, E. and B. Lundgren. 1979. Some aspects on pigment cell distribution 



and function in the developing echinopluteus of Psammechinus miliaris. 



Develop., Growth and Differ., 21, 2, 129-140. 

 Sachs, M.I. 1971. A cytological analysis of artificial parthenogenesis in the 



surf clam Spisula solidissima. J. Ultrastruct. Res., 36, 5/6 806-823. 

 Salvini-Plawen, L. 1972. Zur Morphologie und Phylogenie der MoUusken. 



Die Beziehungen der Candofeveata unds der Solenogastres als Aculifera, 



als Mollusca und als Spiralia (nebst einem Beitrag Zur Phylogenie der 



coelomatischen Raume). Ztschr. viss. Zool, vol. 184, 205—394. 

 Salvini-Plawen, L. 1973. Zur Klaring des "Trochophora" Begriffes. Experientia, 



vol. 20, 1434-1435. 

 Sastry, A.N. 1979. Pelecypoda (excluding Ostreidae). In: Reproduction of 



Marine Invertebrates (eds. A.C. Giese and J.S. Pearse). Acad. Press, New 



York, vol. 5, 113-292. 

 Schechter, V. 1941. Experimental studies upon the egg cells of the clam, 



Mactra solidissima, with special reference to longevity. J. Exp. Zool, 



86, 3, 461^79. 

 Schmekel, L. 1975. Egg and embryo ultrastructure. In: The Sea Urchin Embryo 



(ed. G. Czihak). Springer- Verlag, Berlin — New York, p. 8. 

 Schweinitz, E. and R.A. Lutz. 1976. Larval development of the northern 



horse mussel. Modiolus mediolus (L.), including a comparison with the 



larvae of Mytilus edulis L. as an aid in planktonic identification. Biol. 



Bull., 150, 3, 348-360. 

 Selenka, E. 1880. Keimblatter und Organanlagen der Echiniden Ztschr. wiss. 



Zool., vol. 33, 39-54. 

 Selenka, E. 1883. Studien ilber Entwicklungsgeschichte der Thiere. 2. Die 



Keimblatter der Echinodermen. Wiesbaden, pp. 28-61. 

 Sellmer, G.P. 1967. Functional morphology and ecological life history of the 



gem clam. Gemma gemma (Eulamellibranchia, Veneridae). Malacologia, 



5, 2, 137-223. 

 Semon, R. 1888. Die Entwicklung der Synapta digitata und die 



Stammengeschichte der Echinodermen. Jen. Ztschr. Naturwissen, vol. 22, 



175-309. 

 Sentz-Braconnot, E. 1968. Relation entre le larves planctoniques et les jeunes 



stades fixes chez les Lamellibranches dans la rads de Ville-franche-sur- 



mer (Aples-maritimes). Vie et Milieu, 19, 1-B, 85-108. 

 Shepel', N.A. 1979. Ekologiya midii M. edulis v svyazi s ee kul'tivirovaniem 



V zalive Pos'eta (Yaponskoe more) [Ecology of M. edulis in connection 



with its culturing in Posjet Bay (Sea of Japan)]. In: Promyslovye 



Dvustovorchatye Mollyuski Midii i ikh Rol 'v Ekosistemakh. Izd-vo Zool. 



In-ta AN SSSR. Leningrad, pp. 126-127. 



