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 

 antennae. This latter character also separates it from Herb' 

 stia and Halimus. From the Chorinince it may be distin- 

 guished by the non-concealment of the external antennae, 

 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 

 antennae. 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 antennae considerably exposed. 



This genus, like several others of the tribe, seems to be 

 peculiar to this coast. The species are crabs of large size. 



LOXOKHYNCHUS GRANDIS. Stimpson. 

 Plate XIX. f. 1, and XXII. f. I. 



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 be- 

 come sharp and spine-like anteriorly and on the sides, where 

 they are also more crowded. There are seven spines on 

 the hepatic 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 a 

 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 praeorbital spine is emarginate at its extremity. 

 The feet are rather short and stout, covered with a short, 



