.486 Stimpson on the Crustacea and Echinodermata 
BLEPHAROPODA OCCIDENTALIS. Randall. 
Blepharipoda occidentalis, RANDALL; Jour. Acad. Nat. Sci. Philad. viii. 131, 
BBES ; 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 
Ranpatt in 1839 ; and subsequently named Albunhippa by 
MinwE-Epwanns in the Archives du Muséum 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 Mag. de Zodl. 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 1:143 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. talpoides 
the upper surface is rugose only toward the extremities, 
