178 CLASS CRUSTACEA. 



The ocular pedicles are generally longer than those of the 

 macroura of the following sections. 



Here (the Hippides, Latr.) all the upper segments are 

 solid. The two anterior feet sometimes terminate by a mo- 

 nodactylous hand, or one without fingers, in the manner of a 

 palette, and sometimes they go into a point. The six or four 

 following finish with a fin. The last two are filiform, folded, 

 and situated at the inferior origin of the tail. This tail grows 

 narrow abruptly, immediately after its first segment, which is 

 short and broad, and the last is in the form of an elongated 

 triangle. The lateral appendages of the last but one are in 

 the form of curved fins. The subcaudal appendages are in 

 number four pair, and composed of a very slender and fili- 

 form stem. The antennae are very hairy, or ciliate. The 

 lateral ones at first approach the intermediate, and are after- 

 wards arched, or turned outwards. 



Albunea, Fah., 



Have the two anterior feet tenninated by a very compressed 

 hand, triangular and monodactylous. The last articulation 

 of the following feet is like a reaping-hook. The lateral an- 

 tennae are short. The intermediate are terminated by a single, 

 long, and setaceous thread. The ocular pedicles occupy the 

 middle of the forehead, and form, when united, a sort of 

 muzzle, flat, triangular, with the external sides arched. The 

 testa is almost plane, nearly square, but rounded at the pos- 

 terior angles, and finely denticulate at the anterior edge. 

 The only species well known is (Cancer Symnista, Linn.) 



HIPPA, Fah. — Emerita, Gronov., 



Have the two anterior feet terminated by a very compressed 

 hand, almost ovoid, and without fingers. The lateral an- 

 tennae are much shorter than the intermediate, and rounded. 

 These last are terminated by two short obtuse threads, placed 



