208 
CLASS CRUSTACEA. 
minal valves are very large, cover the whole inferior part of 
the body, and form a sort of receptacle for the eggs. 
All the following Amphipoda have the segments of the 
body perfectly distinct in their whole extent, and none of 
either sex exhibit the long cirri in the form of oars, which are 
seen in the first two of lone. 
In these, the talon or mobile finger, when it exists, of the 
feet terminating in pincers, is formed only of a single articu- 
lation. 
Among these last there are some whose upper antennae are 
much shorter than the under, and even than their peduncle. 
The stem of these is composed of a great number of articu- 
lations. 
Orchestia, Leach, 
Have the second feet terminated in the males by a large 
pincer, with the talon, or long moveable finger, a little curved, 
and by two fingers in the females ; the third articulation of 
the lower antennae is, at most, of the length of the preceding 
two united. (Outsells gammarellus, Pallas.) 
Taljtrus, Latr., 
Have no feet in the form of a claw ; the third articulation of 
the inferior antennae is longer than the preceding two united ; 
these antennae are large and spiny. ( Oniscus locusta, Pall.) 
In the following, the upper antennae are never shorter than 
the lower. 
Some, having, moreover, their antennae elongated, setaceous, 
and terminated by a pluri- articulate stem, and without re- 
markable claws, approach the preceding, in that the upper 
antennae are a little shorter than the lower, and are again re- 
moved from the following, by the form of their head, con- 
tracting in front, like a muzzle ; such are 
