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, Fab., 
Have the two anterior feet terminated by a very compressed 
hand, triangular and monodactylous. The last articulation 
of the following feet is like a reaping-hook. The lateral an- 
tennas 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, Fab . — 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 
