8l2 



FRESH-WATER BIOLOGY 



37 (36) Shell with but three such bands. 



Chlamydotheca mexicana Sharpe 1903. 



Length 2.75 mm., height 

 1.55 mm., width 1.60] mm. 

 No males yet found. Two 

 or three narrow greenish 

 bands irregularly arranged 

 on sides of shell. Furca 

 straight, about twenty- 

 three times as long as wide 

 and faintly toothed on 

 about one-half of dorsal 

 margin. Ponds; Septem- 

 ber. Durango, Mexico. 



Fig. 1262. 



Chlamydotheca mexicana. 



(a) Side view, X 25; 



{b) First leg, X 100; 



(c) Furca, X 125. 



38 (39) Length about four mm Herpeiocypris harhatus Forbes 1893. 



Width 1.60 mm., height 2.00 mm. Shell 

 fairly full, but not plump. Large, hairy, yel- 

 lowish brown in alcohol, with reddish patches 

 on either side. One of the largest of the 

 fresh-water ostracoda. Valves equal. Furca 

 about twenty times as long as wide, slightly 

 sinuate. Yellowstone River, Wyoming. July, 

 August. 



Herpetocypris barhatus. 



Fig. 1263. 

 (a) Side view with shell removed; {b) Furca. 



(After Forbes.) 



39 (38) Length less than three mm 40 



40 (41) Dorsal edge of furca with five combs of coarse teeth (Fig. 1264 h). 



Herpetocypris reptans Baird 1850. 



Length 2.00 mm. to 2.50mm., height 

 0.80 mm. Brownish yellow. Furca 

 about sixteen times as long as wide, 

 slightly curved; its dorsal edge armed 

 with jive combs of coarse teeth. Furca 

 claws coarsely toothed. Muddy bot- 

 toms, ponds; April to September. 

 California. 



Fig. 1264. 



Herpetocypris reptans. (a) Side view; 



(6) Furca. 



