334 
CLASS CRUSTACEA. 
a profounder study than has been bestowed upon it by 
Muller, our only authority on the subject. According to him, 
Cytherea, Mull . Cytherina, Lam., 
Would have eight simple feet, finishing in a point, though it 
is probable that there are but six ; two antennas, equally sim- 
ple, setaceous, composed of five or six articulations, with 
some scattered hairs. 
They are found in the salt waters and the brackish waters 
of the sea-shores, among the sea-weed and confervae. 
If these entomostraca are exclusively marine, it is not sur- 
prising that Jurine and other observers, whose researches, in 
consequence of the places of their residence, could extend 
only to the entomostraca of the fresh water, should not have 
spoken of the Cythereae. 
Cypris, Mull., 
Have but six feet, though M. Ramdohr says four, and M. 
Jurine eight. The first considered the last two as appen- 
dages of the male sex; and the second took the palpi of the 
mandibles, and the branchial plate of each upper jaw^, for so 
many feet. Nor did the latter reckon in this number, those 
which the former presumed to be sexual organs. He regards 
them as filaments of five articulations, issuing laterally from 
the pouch of the matrix, and the use of which he is ignorant. 
The two antennae are terminated in the manner of a fasci- 
culus of setae, like a brush. 
The testa, or shell, forms an ovaliform body, arched and 
gibbous on the back, or on the side of the hinge, almost 
straight, and a little emarginated and reniform, on the oppo- 
site side. In front of the hinge, in the medial line, the eye 
forms a thick blackish and round point. The antennae, in- 
serted immediately underneath, are shorter than the body, 
