* 
452 Stimpson on the Crustacea and Echinodermata 
The genus will be perhaps best characterized by a com- 
parison with others. From Pisa, which it resembles in the 
shape of the carapax, it differs in the less excavated orbits, 
and single supra-orbital fissure, the want of spinules on the 
tarsi, and the much broader basal article of the external 
antenne. This latter character also separates it from Herb- 
stia and Halimus. From the Chorinine it may be distin- 
guished by the non-concealment of the external antenne, 
and the shorter and broader rostrum. It is allied to Para- 
micippa in the deflection of the rostrum, but differs in the 
longer epistome, and the inferior position of the external 
antenne. The cavities of the eye-peduncles are less tubular 
than in Pericera, the eyes being retractile. Perinea has a 
shorter carapax and a much shorter rostrum, leaving the 
external antenne considerably exposed. 
This genus, like several others of the tribe, seems to be 
peculiar to this coast. The species are crabs of large size. 
LOXORHYNCHUS GRANDIS. Stimpson. 
Plate XIX. f. 1, and XXII f. 1. 
Loxorhynchus grandis, STIMPSON; Proc. Bost. Soc. Nat. Hist. vi. 85. 
Carapax pyriform, subglobose ; branchial regions broadly 
expanded somewhat as in Libinia. Surface covered with 
small warts of nearly uniform size, which are blunt and 
rounded about the middle portion of the carapax, but De 
come sharp and spine-like anteriorly and on the sides, where 
they are also more crowded. There are seven spines On 
the hepatie protuberances, two of which are larger. Pubes- 
cence very short and mostly obsolete above, leaving the sur- 
face punctate with minute pit-like depressions. Rostrum @ 
little longer than wide, slit for somewhat more than half its 
length, and greatly deflexed, pointing downward in a direc- 
tion almost at right angles with the horizontal axis of the 
body. The preorbital spine is emarginate at its extremity. 
"The feet are rather short and stout, covered with a 
