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 linger, 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 antennse 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. {Oniscus gammarellus, Pallas.) 



Talttrus, Lair., 



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 



