FISHERY BULLETIN: VOL. 82, NO. 2 



on the carapace that are not ventrally curved, the 

 dorsal posterolateral margin of the carapace is 

 concave, the rostrum is noticeably longer than 

 the antennal flagellum, and the number of pairs 

 of telsonic spines in all zoeal stages (excluding 

 the hairlike process) is 7 + 7 in P. camtschatica 

 and 8 + 8 in P. platypus. 



Placetron wosnessenskii and Rhinolithodes wos- 

 nessenskii. — Zoeae of Placetron wosnessenskii 

 and Rhinolithodes wosnessenskii are readily dis- 

 tinguished from all other described zoeae of the 

 Lithodidae. Placetron wosnessenskii zoeae are 

 distinguished by markedly long, blunt spines on 

 the posterior margins of abdominal somites 2-5 

 and the sinuate curvature of the long, blunt, 

 posterolateral spines on abdominal somite 5. 

 Zoeae of R. wosnessenskii have a spine in the 

 middorsal, posterior margin of the carapace. 



ACKNOWLEDGMENT 



I thank Dave Clausen, Northwest and Alaska 

 Fisheries Center Auke Bay Laboratory, for help- 

 ing me rear the zoeae described in this report. 



LITERATURE CITED 



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324 



