CANDONA. 159 



15. Cypris aurantia. Tab. XIX, fig. 13. 



MoNOCULUS AUKANTius, Juruie, Hist. Monoc, 173, t. IS, f. 5-12. 

 Cypkis aurantia, Besmarest, Cons. geu. Crust., 384. 



— M. Edwards, Hist. Nat. Crust., iii, 402. 



Shell oval, rounded on dorsal margin, slightly sinuated 

 on ventral margin ; beset all round with short hairs. 

 Anterior extremity rather narrower than posterior. The 

 shell is of a finely polished appearance, and of an orange 

 colour. On the posterior half it is marked with a rather 

 broad band of a lighter hue, running obliquely across ; the 

 darker portions of the shell, on each side of it, terminating 

 abruptly in a marked line of a deeper colour than the 

 general shade of the rest of the shell. 



Hab. — Blackheath, June. Windsor Great Park, July. 

 Dover, September 1849. 



Genus 2— Can don a. 



Character. — Externally resembling Cypris ; l3ut the in- 

 ferior or pediform antennae are destitute of the pencil of 

 long hairs which characterise that genus. The animal 

 creeps at the bottom or upon aquatic plants, instead of 

 swimmino; freelv throuo-h the water. 



The genus Cypris, as established by Miiller, had, up to 

 1845, remained intact. As, however, a number of the 

 species which have been described possess a set of organs 

 which many others do not, and which exercise a decided 

 influence upon their economy and habits, I thought it be- 

 came incumbent to separate the two sets of species into 

 distinct genera. In the one series the animals have a much 

 greater degree of motion and agility than the others, swim- 

 ming freely and rapidly through the water in all directions, 

 and apparently possessing a higher degree of enjoyment 

 in their existence. This arises from the bundle of long 

 plumose setae which spring from the second articulation of 

 the posterior or pediform antenna? described above (p. 

 145), and by means of which they can suspend themselves 

 in the water, or transport themselves through it with 

 great facility. For this set I have retained the name of 



