80 Notes on North American Crustacea. 



Kostrum short ; superior part with six short spines ; inferior spine slen- 

 der and acute, curved upward, a little overreaching the eyes. The 

 antennae are very short, and the acicle has five or six spines on each, 

 side. Feet short, and almost exactly like those of E. cibarivs, except 

 that in the chelipeds, the carpus has below a deep smooth sinus, and the 

 carpus-joint of the second feet a corresponding sinus, somewhat shal- 

 lower, however; — when the feet are folded these sinuses, coming together, 

 form on each side of the body a round hole half an inch in diameter. 

 Something of the same kind, but very much smaller and not at all 

 conspicuous, is seen in E. ciharius. It probably serves for the passage 

 of water to the gill-openings, which would otherwise be somewhat 

 obstructed by the close folding of the chelipeds against the facial 

 region. 



The above description is drawn up from a specimen sent 

 me bj Dr. Trask of San Francisco. The dimensions of this 

 are — length of carapax, 5*20 ; breadth, 6*10 inch. 



Two examples of this species are in the possession of its dis- 

 coverer, Dr. Trask, both of which were taken off the coast of 

 California, near San Francisco. 



Fhyllolithodes papillosum. 



PhyllolitJiodes papillosus, Brandt ; Bulletin phys.-mathem. de 1' Acade- 

 mic de St. Petersb. 1849, vii. ITS. 



Petalocerus J5eZZmwMs, "White ; Proc. Zool. Soc, 1856. p. 134. pi. xlii. 



Mr. White's figure of this species having been published, 

 there is no longer any doubt that his species is identical with 

 that of Brandt. His description of the abdomen of the crab 

 is rather " curious" than satisfactory. 



Found in the stomachs of percoid fishes (" Cabesones") taken 

 off Monterey, Cal., by Mr. Taylor. 



