of the Pacific Shores of North America. 455 



LIBINIA AFFINIS. Randall. 



Libinia affinis, Randall ; Jour. Acad. Nat. Sci., Philad. viii. 107. Gibbes, 

 Proc.Am. Assoc. 1850, p. 170. 



This species is rare, Nuttall's specimen being the only 

 one yet found. It is very closely allied to L. canaliculata of 

 the eastern coast, but differs in its less convex carapax and 

 smoother hand. 



Upper California, (Nuttall.) 



Mus. Phil. Acad. 



CHOEILIA LONGIPES. Dana. 

 Chorilia longipes, Dana ; U. S. Expl. Expedition, Crust, i. 91 ; PL I. f. 5. 



This species may be distinguished from the other Oxy- 

 rynchs of this coast by its long, bifid, pubescent rostrum, the 

 forks of which are nearly parallel. The carapax is without 

 pubescence, with a few distant tubercles and a sharp spine 

 on each side at the branchial region. The legs are long, 

 and, with the exception of the first pair, very slender. It is 

 about 1| inches in length. 



Oregon, (Expl. Exped.) 



Mus. Expl. Exped. 



SCYRA ACUTIFRONS. Dana. 

 Scyra acutifrons, Dana ; U. S. Exploring Expedition, Crust, i. 95 ; PI. II. f. 2. 



This little crab may be recognized by its ovate spineless 

 carapax, the regions of which are strongly prominent ; and 

 by its short, bifid, lamellar rostrum. 



Puget Sound, (Pickering.) 



Mus. Expl. Exped. 



OTHONIA PICTETL De Saussure. 



Othonia Picteti, De Saussure ; Revue et Magasin de ZoQlogie, v. 357, PI. 



XIII. f. 2. 



Mazatlan, (Verreaux.) 



