HAYNES: PREZOEAE AND ZOEAE OF CHIONOECETES 



logical differences among the zoeae were slight. 

 The most obvious difference was size — my stage 

 I zoeae were nearly twice as large as Hart's 

 stage I zoeae. Another difference is the mor- 

 phology of the antennule: According to Hart 

 (1960) zoeae of O. gracilis and H. lyj-attis had 

 two aesthetes and one seta (although in speci- 

 mens of 0. gracilis sent me by Hart, the 

 antennule had two setae instead of one), whereas 

 in C. hairdi and C. opilio the antennule had 

 three aesthetes and two setae. A third dif- 

 ference was the length of the posterior lateral 

 spines: In stage I C. hairdi and H. lyratus, 

 the spines extended beyond the posterior margin 

 of the adjacent segment about one-third the 

 length of the spine, but in C. opilio and O. gracilis 

 they barely reached the posterior margin of 

 the adjacent segment. In addition to the above 

 differences, Hart did not describe the protuber- 

 ances on the eyestalks or the minute spinule 

 located between the dorsal and lateral spines 

 on the telson furcations; on the specimens sent 

 me by Hart, I found no minute protuberances 

 on the eyestalks but did find the minute spinule. 



LITERATURE CITED 



AlKAWA, H. 



1937. Further notes on Brachyuran larvae. Rec. 

 Oceanogr. Works Jap. 9:87-162. 

 Garth, J. S. 



1958. Brachyura of the Pacific coast of America. 

 Oxyrhyncha. Allan Hancock Pac. Exped. 21, 854 p. 

 GURNEY, R. 



1942. Larvae of decapod Crustacea. Ray Society, 

 Lond. 129, 306 p. (Reprinted 1960, H. R. Engel- 

 niann (J. Cramer), Weinheim/Bergstr., Germany.) 

 Hart, J. F. L. 



1960. The larval development of British Columbia 

 Brachyura. II. Majidae, subfamily Oregoniinae. 

 Can. J. Zool. 38:539-546. 

 KoN, T. 



1967. Fisheries biology of the tanner crab, Chiunoe- 

 ceies opilio — I. On the prezoeal larvae. [In Jap., 

 Engl, abstr.l Bull. Jap. Soc. Sci. Fish. 33:726-730. 

 Kurata, H. 



1963. Larvae of Decapoda Crustacea of Hokkaido. 

 2. Majidae (Pisinae). Bull. Hokkaido Reg. Fish. 

 Res. Lab. 27:25-31. (Fish. Res. Board Can., Transl. 

 Ser. 1124.) 

 Lebour, M. V. 



1928. The larval stages of the Plymouth Brachyura. 

 Proc. Zool. Soc. Lond., p. 473-560. 



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