ISO 
CLASS CRUSTACEA. 
antennae presents an appendage or projection proceeding into 
a point, or in the form of a spine. 
These Crustacea, which the Greeks name carcinion , and 
the Latins cancelli , live for the most part in univalve and 
empty shells. Their tail (. Birgus excepted) presents, and in 
the females only, but three false feet, situated on one of the 
sides, and divided, each, into two filiform and hairy branches. 
The three last segments are suddenly more narrow. 
In some, such as 
Birgus, Leach , 
The tail is tolerably solid, suborbicular, with two ranks of ap- 
pendages, in the form of laminae, underneath. The fourth 
feet are only a little smaller than the two preceding ; the two 
last are folded and concealed, their extremity lodging in a 
depression of the base of the thorax. The fingers of the end, 
as well as those of the last pair but one, are simply hairy or 
spinous. With the exception of the claws, all the feet are 
separated at their origin by a very sensible interval. The 
thorax is in the form of an inverted heart, and pointed in 
front. ( Cancer latro , Linn.) 
Pagurus, Fab . 
The last four feet are much shorter than the preceding, 
with the forceps charged with small grains. The tail is soft, 
long, cylindrical, narrowed towards the end, and usually pre- 
sents but one rank of oviferous appendages, and which are in 
the form of a thread. The thorax is ovoid or oblong. 
Some species, Ccenorita, Latr ., are distinguished from 
the others by their advanced antenna), and the middle ones 
are almost as long as the exterior or lateral, and have elon- 
gated threads. The thorax is ovoido-conical, narrow, elon- 
gated, very much compressed laterally, and with the anterior 
