FISHERY BULLETIN: VOL. 80. NO. 2 



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FuaiRE 5.— Sequential development of gonadal material in the dorsal-ventral plane in Arctica islandica. A. Female, dorsal sec- 

 tion, spent gonadal tissue. Scale bar 100 ji. B. Female, midventral section, partially spent gonadal tissue. Scale bar 100 p. C. Female, 

 ventral section, ripe gonadal tissue. Scale bar 100 p. Preparations A-C from one clam. D. Male, dorsal section, ripe spermatozoa. 

 Scale bar 10 /u. E. As for D except scale bar 50 m- F. Male, ventral section, late active development. Scale bar 100 n. Preparations E 

 and F from one clam. Both clams from Station I), 15 June 1979. 



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