46 Crustacea and Echinodermata of the 



BLEPHAROPODA OCCIDENTALIS. Randall. 



Blepharipoda occidentalis, Randall; Jour. Acad. Nat. Sci. Philad. viii. 131. 



PI. VI. Gibbes ; Proc. Am. Assoc. 1850, p. 187. 

 Albunhippa occidentalis, Dana ; U. S. Exploring Expedition, Crust, i. 404. 



Blepharopoda is a well-marked genus first instituted by 

 Randall in 1839 ; and subsequently named Albunhippa by 

 Milne-Edwards in the Archives du Museum d'Histoire 

 Naturelle, Vol. II. (1841.) The name Blepharopus occurs 

 in Entomology ; but this is scarce near enough to Ran- 

 dall's term to warrant its rejection. 



Hab. San Diego, (Nuttall.) 



Mus. Phil. Acad. 



hippa analoga. Stimpson. 



Hippa emerita, De Saussure ; Rev. et May. de ZaOl. v. 367. 



Hippa talpoidea, Dana; Proc. Acad. Nat. Sci. Philad. 1854, vii. 175. 



Hippa analoga, Stimpson ; Proc Bost. Soc. Nat. Hist. vi. 85. 



In an examination of a great number of specimens of the 

 common Californian Hippa, and a careful comparison of 

 them with specimens from all parts of the eastern coast of 

 the United States, I find differences which are so constant, 

 that it is not difficult to determine at a glance, with regard 

 to any specimen, whether it be from the eastern or western 

 side of our continent. This being the case, I have been 

 led to propose a new name for the western species. 



It differs from H. talpoidea in the following characters. It is 

 much broader, — the breadth of the carapax being to its length 

 as 1 to 1.29 ; against 1:1.43 in H. talpoidea. It is more de- 

 pressed, and the back is much less arched and convex, along 

 the middle. In H. talpoidea the posterior margin of the cara- 

 pax is concave on each side, and its postero-inferior corner 

 forms a lobe-like projection ; while in our species the mar- 

 gin is straight and forms no projection. In H. talpoidea 

 the upper surface is rugose only toward the extremities, 



