ORDER DECAPODA. 169 



In his Lihiiiia, properly so called, the claws of the males 

 are thicker than the two following feet, and almost as long ; 

 the length of those which are the longest is not altogether 

 double that of the testa. {Lihinia canaliculata, Say. emar- 

 ginata, Leach.) 



The claws of the males of Doclcea are notably shorter than 

 the two following feet; the length of these feet scarcely ex- 

 ceeds more than once and a half that of the testa, which is 

 almost globular, and always covered with a brown or blackish 

 down. {Doclcea Rissonil, Leach.) 



In Egeria the claws are filiform, with the hands very much 

 elongated, and almost linear. The following feet are five or 

 six times longer than the testa. The body is triangular. 

 (^Egeria Indica, Leach.) 



After having reviewed the subgenera of this tribe, whose feet 

 coming after the claws are of an identical form, and whose tail 

 is composed, in the females at least, and most frequently in 

 both sexes, of seven articulations or complete segments, we 

 shall pass to those in which it presents but six at most. The 

 feet are generally long and filiform, as in the last subgenera. 

 If we except leptopm, these Crustacea are again remote from 

 the preceding, in the relation of the form of the third articu- 

 lation of the external jaw-feet; it is proportionally more nar- 

 row, contracted at its base, and the following articulation 

 appears to be inserted at the middle of its upper edge, or 

 more externally. The following subgenus differs from those 

 which succeed it, by having but three_; segments in the tail 

 of the males. The form of the third articulation of the ex- 

 ternal jaw-feet appears to me to be in other respects the 

 same as in the preceding subgenera. 



Leptopus, Lam. 

 Tlie tail of the females is formed of five segments. The 



