106 
CRUSTACEA. 
Catalogue of the Crustacea brought by Thomas 
Nultall and J. K. Townsend, from the West Coast 
of North America and the Sandwich Islands, with 
Descriptions of such Species as are apparently 
new, among which are included several species of 
different localities, previously existing in the col- 
lection of the Academy. By J. W. Randall. 
Read. June 18th, 1839. 
Crustacea Brachyura. 
Fam. Maiadce. 
Genus Libinia, (Leach.) 
Libinia — (variety of L. canaliculata? Say.) Mus. 
Acad. 
The hitherto described species of the genus Li- 
binia, as restricted by M. Milne Edwards, have so 
great a mutual resemblance, that we hesitate to con- 
sider the present one as new, until more specimens 
have been obtained for comparison. 
Its principal peculiarities may be thus stated. 
L. Testa multispinosa, manibus politis, vix granulatis. 
Rostrum elongate, somewhat flattened above, and 
channeled at base. Anterior feet polished, and not 
perceptibly granulated. Shell pyriform, only slight- 
ly convex, and studded with a great number of 
sharp spines, interspersed with tubercles. The la- 
teral spines are six or seven on each side, the dor- 
sal row about eight, intermediate ones about a 
dozen on each side, more or less elongated. The 
tubercles are about as numerous as the spines, and 
scattered irregularly between them. Second pair 
