22 
BRITISH ENTOMOSTRACA. 
at its extremity ; the second pair consisting of two portions 
also, the internal of which is a short oval plate, ciliated 
at its edges; and the external longer, cylindrical, and 
surmounted with a styliform appendage. 
The body of the animal, consisting of the thorax and 
abdomen, is of a nearly cylindrical shape, and is composed 
of thirty articulations, which are joined to each other by 
means of a membrane that permits a considerable degree 
of motion. They diminish gradually in size as they reach 
the posterior extremity, which projects for some distance 
beyond the carapace, and are studded all over with short, 
stout, hooked spines. 
The feet are very numerous, amounting to about sixty 
pairs, and extend from the mouth downwards, lying 
along the edge of the alimentary canal. The first pair 
(t. I, f. d) are very long compared with the others, 
are situated immediately behind the mouth, and are 
ramiform. They are composed of a basilar portion, and 
several appendages. The basilar part is divided into 
three joints : the anterior joint gives off two very long, 
cylindrical, moveable appendages, which consist of nu- 
merous small articulations (the one having about sixty 
and the other about fifty), and a short, flat body ciliated 
on its edges, which Schoefier describes as a claw-like pro- 
duction. The middle joint gives off another numerously 
articulated cylindrical appendage, formed exactly like the 
other two, but shorter (having only about thirty articula- 
tions), and, like them, possessing a great extent of motion ; 
while the posterior joint gives off a fourth, somewhat simi- 
lar, but much shorter (having only six articulations), and 
apparently not possessed of any motion. At the extre- 
mity of this joint are several ciliated bodies, which Schoefier 
calls false teeth* (one being round and possessing very 
short setae, the other oval and having about thirty long 
ones); and underneath we see attached to the middle joint 
a branchial plate, of a triangular form, with strongly 
* The figure I have given of this pair of feet, being taken from the organ 
in situ , these parts are not exhibited. 
