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BRITISH ENTOMOSTRACA. 
merely give the species alone, or repeat the few remarks 
made by Muller, without making any comment or original 
observations of their own. Lamarck, in his 4 Anim. 
s. Vert./ 1818, changes Muller’s name, and gives the 
genus the appellation of Cytherina, while Desmarest, in 
his ‘Cons, sur Crust./ 1825, in repeating the observa- 
tions made by Muller, and giving merely his species, adds, 
that it may turn out that some of the feet may be par- 
ticular organs, and that the number may be found to be 
the same as in the Cypris, — a conjecture which Latreille 
also makes in the last edition of Cuvier’s 4 Regne Anim.,’ 
1829. Desmarest moreover says, 44 reasoning from ana- 
logy, we are led to believe that the Cythere, like the 
Cypris, has branchial plates attached to the mandibles and 
jaws, and that their feet are solely destined for locomo- 
tion.” * 
Anatomy and Physiology , 8fc . — The shell in almost every 
respect strictly resembles that of the Cypris; but from 
its general opacity and minuteness it is exceedingly 
difficult to examine with precision the body of the 
inclosed animal. After repeated attempts, however, to 
break down the horny opaque shell I succeeded so far as 
to discover that, like the Cypris, the body is divided into 
two parts connected with each other by a narrow space ; the 
anterior or thoracic portion containing the eye, the supe- 
rior and inferior antennae, organs of mouth, and two pairs 
of feet; the posterior or abdominal portion, containing 
the third pair of feet, and a short appendix or tail. 
The eye resembles in appearance and situation that of 
the Cypris, being single, fixed, and in form of a black 
sessile point. 
The superior antennae (t. XX, f. 5 b) are composed 
each of seven joints, furnished with one or two short 
setae at the base of each of the four last articulations, 
and terminated by several rather longer hairs at the 
* Cons. gen. et part., &c., p. 387. 
