of the Pacific Shores of North America. 477 
ECHIDNOCERUS CIBARIUS. White. 
Echidnocerus cibarius, WnrrE; Proc. Zoél. Soc. 1848, 47. Annulosa, PI. II. 
IX. Brit. Mus. Cat. Crust. 56. 
Lopholithodes Mandtii, Branpt; Bulletin phys.-mathém. de l'Académie de St. 
Pétersboury, 1849, vii. 174. 
The dimensions of the carapax in a specimen from Sitka 
are: length, 6.90; breadth, 8.35 inch. 
he members of this remarkable genus are among the 
largést erabs known. They do not indeed cover so much 
Space as do many of the Maiacee 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 ŒE. 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. 
ECHIDNOCERUS SETIMANUS. Stimpson. 
Ctenorhinus setimanus, GIBBONS ; Proc. Cul. 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 o 
specimens of the same age and sex can be instituted. Ihave 
fore 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, 
‘ome differences which may prove constant. In the Cali- 
fornian (female) specimens, the spines of the carapax, ros- 
» feet, etc., are everywhere blunt, being rather tubercles 
than Spines; the carapax is proportionally broader, and the 
B'eatest transverse diameter is at the large po 
