414 Dr. Baird on some new Genera and Species 



Abdomen terminated by a long, slender, bifid tail. Posterior or 

 pediform antennae furnished with a bundle of long setae, generally 

 plumose. Animal swims freely in the water. 



The Cypris tristriata, Baird, Trans. Berw. Nat. Club, i. p. 99. 

 t. 3. f. 13, (the C.pubera, Baird, Mag. of Zool. Bot. i. p. 524. 

 t. 16. f. 1 — 13,) will serve as the type of this genus. 



Gen. 2. Candona, 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 antennae 

 not furnished with a bundle of long setae. Animal creeps at the 

 bottom or upon aquatic plants, &c. 



The Cypris reptans, Baird, Mag. Zool. Bot. i. p. 135. t. 5. f. 5, 

 will serve as the type. 



Gen. 3. Cythere, MUller. 

 Three pairs of feet, all external to the shell. Abdomen short 

 and blunt. Pediform antennae not furnished with a bundle of 

 long setae, but possessing one stout articulated filament. Animal 

 creeps at the bottom or upon submerged plants, &c. 



Genus Cypris. 

 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- 

 tennae provided with five or six long setae. 

 Hah. Pond at Highgate. British Museum. 



Sp. 2. C. sella, n. s. PI. IX. f. 3. 



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 antennae pro- 

 vided with long setae (f. 3 a). This species resembles a little the 

 C. vidua in shape, but is smaller and difi'ers very considerably in 

 the markings, which are uniformly the same. 



Hah. Pond on Clapham Common. Brit. Mus. 



