of the Pacific Shores of North America. | 457 
trum bifurcate, horns diverging. The deep constriction 
between the hepatic and branchial regions renders it easily 
distinguishable from all other crabs of this coast, except 
perhaps Hyas lyratus, which has a simply cleft rostrum. In 
the present species the post-orbital expansions are trian- 
ar. : 
Puget Sound, (Expl. Exped.) 
Mus. Expl. Exped. 
PUGETTIA RICHII. Dana. 
Pugettia Richii, Dana; U. S. Exploring Expedition, Crust. i. 117, by ME Ges 
In this the post-orbital expansions are bilobate, with the 
lobes acute. Larger than the preceding; anterior feet of 
great size, 
San Diego, ( W. Rich.) 
Mus. Expl. Exped. 
EPIALTUS PRODUCTUS. Randall. 
Epialtus productus, RANDALL; J. A. N. S. Phil. viii. 110. GrBBES ; Proc. Am. 
"yam 1850, p. 173. Dana; U. S. Exploring Expedition, Crust. i 138, Pl. VI. 
2. 
Easily recognized by its smooth quadrate carapax, with 
two distant teeth on either side. It is the most common 
maioid crab on the coast of California and Oregon, and is 
usually found among sea-weeds on rocks just below low- 
water mark. Its color is olivaceous when alive. ` 
Puget Sound, (Suckley;) Mouth. of the Columbia, 
(Trowbridge ;) Farallone Is. (Trowbridge ;) Tomales Bay, 
(Samuels ;) entrance of San Francisco Bay, (Stimpson ;) 
Monterey, (Trowbridge.) | : 
Mus. Smithsonian; Bost. Soc.; Phil. Acad. ; Paris ; 
Acad. Petrop, 
JOURNAL B. s, N. H. 59 
