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- 

 gular. 



Puget Sound, (Expl. Exped.) 



Mus. Expl. Exped. 



PUGETTIA EICHIL Dana. 

 Pugettia Richii, Dana; U. S. Exploring Expedition, Crust, i. 117, PL IV. f. 3. 



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 PEODUCTUS. Randall. 



Epialtus productus, Randall; J. A. N. S. Phil. viii. 110. Gibbes ; Proc.Am. 

 Assoc. 1850, p. 173. Dana; U. S. Exploring Expedition, Crust, i. 133, PI. VI. 

 f. 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 



