24 Crustacea and Echinodermata of the 



The dimensions of two specimens from San Francisco 

 Bay are as follows : — 



£ Length of carapax, 2.43 inch ; breadth, 3.70 ; proportion, 1:1.52. 

 9 " " 2.13 " " 3.08; " 1:1.45. 



The male is therefore broader than the female. 



Its hairiness and the great length of the outer antennae 

 distinguish it from all other species. In a variety found in 

 Tomales Bay, the upper surface of the carapax is hairy as 

 well as the sides. The middle tooth of the inter-antennary 

 front is sometimes wanting in this, as in other species. 



It is not uncommon about the mouth of San Francisco 

 Bay, inhabiting rocky bottoms at the depth of two or three 

 fathoms. It was also found at Monterey by Mr. Taylor, 

 and at Tomales Bay by Mr. Samuels. 



Mus. Bost. Soc. ; Smithsonian ; Phil. Acad. ; Paris ; 

 Acad. Petrop. 



ozius VEBEEAUXn. De Saussure. 



Ozius Verreauxii, De Saussure ; Ri vm et Magasin de ZoOlogie, v. 359, 

 PI. XII. f. 1. 



Mazatlan, (Verreaux.) 

 3Ius. Phil. Acad. 



Tribe CORYSTOIDEA. 



TRICHOCERA OREGONENSIS. Dana. 



Trichoccra Oregonensis, Dana ; U. S. Exploring Expedition, Crust, i. 299, 

 PI. X VIII. f. 5. 



This little crab has much the aspect of a small Cancer, 

 and may be recognized by its rounded carapax, hairy legs, 

 and long antennap. The whole margin (including the pos- 

 tero-lateral) is dentate with about thirteen teeth on each 

 side. 



Puget Sound, (Expl. Exped.) 



Mus, Expl. Exped. 



