of the Pacific Shores of North America. 477 



ECHIDNOCEEUS CIBARIUS. White. 



Echidnocerus cibarius, White; Proc. ZoGl. Soc. 1848, 47. Annulosa, PI. II. 



III. Brit. Mus. Cat. Crust. 56. 

 Lopholithodes Mandtii, Brandt ; Bulletin phys.-mathem. de V Academie de St. 



Petersboury, 1849, vii. 174. 



The dimensions of the carapax in a specimen from Sitka 

 are : length, 6.90 ; breadth, 8.35 inch. 



The members of this remarkable genus are among the 

 largest crabs known. They do not indeed cover so much 

 space as do many of the Maiacece with their legs extended ; 

 but their carapax is nearly as large, and their weight greater 

 than even in the Macrocheira of Japan. Specimens have 

 been taken the weight of which exceeded seven pounds ; 

 the diameter of the carapax being over ten inches. 



The species E. cibarius was found at the mouth of the 

 Columbia by Sir George Simpson ; and at Sitka by Wos- 

 nessenski, Trowbridge, and the North Pacific Expedition. 



Mus. Brit. ; Acad. Petrop. ; Smithsonian. 



ECHIDNOCEEUS SETIMANUS. Stimpson. 



Ctenorhinus setimanus, Gibbons ; Proc. Col. Acad. Nat. Sci. i. 48, (1855.) 

 Echidnocerus setimanus, Stimpson; Proc. Cal. Acad. Nat. Sci. i. 88. 



This species most closely resembles the preceding, and 

 will perhaps prove the same when direct comparisons of 

 specimens of the same age and sex can be instituted. I have 

 before me a considerable number of specimens both of the 

 Sitka and the California species, but those from the former 

 locality are all males, and those from the latter, as it unfor- 

 tunately happens, are all females. There are, however, 

 some differences which may prove constant. In the Cali- 

 fornian (female) specimens, the spines of the carapax, ros- 

 trum, feet, etc., are everywhere blunt, being rather tubercles 

 than spines ; the carapax is proportionally broader, and the 

 greatest transverse diameter is at the large postero-lateral 



