' 
414: Dr. Baird on some new Genera and Species 
Abdomen terminated by a long, slender, bifid tail. Posterior or 
pediform antenne furnished with a bundle of long sete, generally 
plumose. Animal swims freely in the water. 
The Cypris tristriata, Baird, Trans. Berw. Nat. Club, i. p. 99. 
t. 3. f. 18, (the C. pubera, Baird, Mag. of Zool. Bot. i. p. 524. 
t. 16. f. 1—18,) will serve as the type of this genus. 
Gen. 2. Canpona, Baird, Trans. Berw. Nat. Club, 1845, 
vol, ii. p. 152. | 
Two pairs of feet, one pair contained within the shell. Abdo- 
men terminated by a long, slender, bifid tail. Pediform antennze 
not furnished with a bundle of long sete. Animal creeps at the 
bottom or upon aquatic plants, &c. : 
The Cypris reptans, Baird, Mag. Zool. Bot. i. p. 135. t. 5. £. 5, 
will serve as the type. 
Gen. 3. Cyturern, Miiller. 
Three pairs of feet, all external to the shell. Abdomen short 
and blunt. Pediform antenne not furnished with a bundle of 
long sete, but possessing one stout articulated filament. Animal 
creeps at the bottom or upon submerged plants, &c. 
Genus Crpris. 
Sp. 1. C. elliptica, n.s. Pl. IX. f. 2. 
Nearly elliptical in shape, of a light green colour clouded with 
darker patches of the same colour on the sides of the shell. 
Hairy round the edges, but otherwise glabrous. Pediform an- 
tenn provided with five or six long sete. 
Hab. Pond at Highgate. British Museum. 
Sp. 2. C. sella,n.s. Pl. IX. £38. 
Shell somewhat elliptical in shape, and rather globose, about 
half the size of preceding, of a uniform light greenish colour, 
marked on the back and side with a patch of a dark colour, A 
dark streak runs along the upper edge of the shell, beginning 
from immediately behind the eye and terminating at about the 
same distance from posterior extremity. It there extends a 
short way down the side and then runs forward a little way in a 
somewhat lunated shape. At the anterior commencement of the 
dorsal mark a narrower streak of the same colour runs down the 
side, stopping only a short distance from anterior margin. The 
shell is densely set all round with hairs. Pediform antennze pro- 
vided with long sete (f.3 a). This species resembles a little the 
C. vidua in shape, but is smaller and differs very considerably in 
the markings, which are uniformly the same. 
Hab. Pond on Clapham Common. Brit. Mus. 
