CANDONA. 
159 
15. Cypris aurantia. Tab. XIX, fig. 13. 
Monocultjs atjrantitjs, Jurine, Hist. Monoc., 173, t. 18, f. 5-12. 
Cypkis aurantia, Desmarest, Cons. gen. 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~ Candona. 
Character . — -Externally resembling Cypris ; but 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 
swimming freely through the water. 
The genus Cypris, as established by Muller, 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 antennae 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 
