46 CRUSTACEA. 



antennae compressed and carinated; ocular pedicles, when erected, 

 entirely exposed. The body is sub-ovoid(l). In the 



Libinia, Leach, 



The ocular fossulae are very small and nearly orbicular, and the 

 ocular pedicles are very short, and but very slightly exertile. The 

 second joint of the lateral antennae is cylindrical, and not compress- 

 ed, or but very slightly so. The body is nearly globular, or trian- 

 gular. 



We will unite the Doclsea and the Egeria of Leach, to his Li- 



BINI.ffi. 



In his Libiniae, properly so called(2), the claws of the males are 

 thicker than the two following feet and almost as long. The length 

 of the longest does not exceed twice that of the shell. 



The claws of the male Doclaea(3) are much shorter than the two 

 following feet. The length of the latter is hardly more than once 

 and a half that of the shell, which is nearly globular and always co- 

 vered with a brown or blackish down. 



In the Egeriae(4) the claws are filiform and the hands much elon- 

 gated and almost linear. The following feet are five or six times 

 longer than the shell. The body is triangular. 



Having reviewed all the sub-genera of this tribe in which the feet 

 subsequent to the claws are of a similar form, and in which the tail, 

 of the females at least, and most generally in both sexes, is composed 

 of seven complete joints or segments, we now pass to those in which 

 it never consists of more than six. The feet are usually long and 

 filiform, as in the last sub-genera. With the exception of the Lep- 

 topi, these Crustacea are also removed from the preceding by the 

 form of the third joint of the external foot-jaws. It is proportion- 

 ally narrower, and contracted at base, and the ensuing joint appears 

 to be inserted in the middle of its superior margin, or more exter- 

 nally. The following sub-genus differs from those which succeed 

 to it, in the tail of the males, where we only find three segments. 

 The form of the third joint of the external foot-jaws appears to me 

 the same as in the preceding sub-genera. 



(1) Cancer araneus, L.; Leach, Make. Brit., XXI, A; Herbst., XVII, 59? 

 Hyas coarctata, Leach, lb., xxi, IJ. 



(2) Libinia canaliculata, Say, Journ. Acad. Nat. Sc. Philad. vol. I, p. 77, iv, 1; 

 L. emarginata, Leach, Zool. Misc., cviii. 



(3) Doclaca Rissonnii, Leach, Zool. Misc., lxxiv. The Inachus ovis and the T. 

 hybridua, Fab., should be referred to it. 



(4) Egeria indica, Leach, Zool. Misc., lxiii; Inachus spinifer, Fab. 



