1 li I HHITTSII EXTOMOSTI! \( A 



merely give the species alone, or repeat the few remarks 

 made by M filler, without making any comment or original 

 observations of their own. Lamarck, in his 'Anim. 

 s. Vert./ 1818, changes M filler's name, ami gives the 

 genus the appellation of Cytheriiui, while Dcsmarest, in 

 his 'Cons, sur Crust./ 182 5, in repeating the observa- 

 tions made by Miillcr, 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 * Rcgne Anim., 

 1829. Desmarest moreover says, "reasoning from ana- 

 logy, we are led to believe that the Cytherc, 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 t $c. 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 di\ided into 

 two parts connected with each other by a narrow space ; the 

 anterior or thoracic portion containing the eye, the supe- 

 rior and inferior antenna*, 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 antenna- (t. \\ : f. 5 /;) are composed 

 each of seven joints, furnished with one or two short 

 setae at the base of each of the four last articulations, 

 ;md terminated by several rather longer hairs at the 



i ons -' n <' part., &c , p '-'^1 



