22*2 
CLASS CRUSTACEA. 
Anthuea, Leach , 
Have the body vermiform, and the antenna? scarcely as long 
as the head, with four articulations. The leaflets of the 
posterior fins form by their disposition and approximation a 
sort of capsule. 
The anterior feet are terminated by a monodactylous pin- 
cer. 
In the fourth section, Idoteides, Leach, the antenna? are 
also four in number, but on the same horizontal and trans- 
verse line. The lateral are terminated by a stem, finishing 
in a point, gradually growing more slender, and pluri-articu- 
lated. The intermediate are short, filiform, or a little thicker 
towards the end, of four articulations, none of which is di- 
vided. The composition of the mouth is the same as in the 
preceding sections. The gills are in the form of bladders, 
(white in the majority) susceptible of being swelled to serve for 
swimming, and covered by two lamina?, or valvules, of the last 
segment, adhering laterally to its sides, longitudinal, biarticu- 
late, and opening in the middle by a straight line, like two 
shutters. The tail is formed of three segments, the last of 
which is much largpr, without appendages at the end, or 
lateral fins. 
Idotea, Fab., 
Have all the feet strongly unguiculated, identical ; the body 
oval, or simply oblong, and the lateral antennae shorter than 
one half of the body. Oniscus entomon, Lin. 
Stenosoma, Leach, 
Differ only in the linear form of the body, and the length 
of the antennae exceeding the half of that of the body. ( Ste - 
nosoma lineare, Leach.) 
