Pacific Shores of North America. 9 



This species may be distinguished from C. opilio, Kroyer, 

 judging from the descriptions of that naturalist, by the 

 shorter feet of the male ; — those of the second pair, in the 

 species here described, being not more than twice the length 

 of the carapax, while those of the first pair are not much more 

 than half as long as those of the second. The abdomen 

 consists in both male and female of seven articles, the three 

 nearest the base being strongly granulated. Kroyer, in his 

 diagnosis of the genus, states the number of articles to be 

 six, although O. Fabricius* gives seven as the number in 

 his Cancer phalang-ium. 



It inhabits deep water, the specimens described being 

 dredged on a muddy bottom at the depth of thirty fathoms, 

 off Cape Romanzoff. It was also found in Behring's 

 Straits, by Commodore Rodgers, of the North Pacific 

 Expedition. 



It is in the Museums of the Boston Society of Natural 

 History, of the Smithsonian Institution, and of the Jardin 

 des Plantes.f 



* Fauna Gronlandica, p. 234 ; n. 214. 



t As it is always desirable to know where typical specimens may be found for 

 comparison, I shall indicate in every case the different museums in which exam- 

 ples of the species herein catalogued are deposited. For convenience, the fol- 

 lowing abbreviations will be used : — 

 Museum of the Boston Society of Natural History . Mus. Bost. Soc. 

 " " " Smithsonian Institution . . . . " Smithsonian. 

 " " " Philadelphia Academy of Natural Sciences " Phil. Acad. 

 " " - U. S. Exploring Expedition . . . " Expl. Exped. 

 " " " California Academy of Natural Sciences " Cal. Acad. 



" " Yale College " Yale. 



" " :< Imperial Academy of St. Petersburg . " Acad.Petrop. 



" " Berlin " Berlin. 



" " the Garden of Plants at Paris . . . .. " Paris. 

 " " " Royal College of Surgeons, London . . " R. C. S. 

 " " " Zoological Society of London . . . " Zool. Soc. 

 British Museum " Brit. 



2 



