8i2 FRESH-WATER BIOLOGY 



37 (36) Shell with but three such bands. 



Chlamydotheca mexicana Shaipe 1903. 



Length 2.75 mm., height 

 1.5s mm., width i.6o]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. Duiango, Mexico. 



Fig. 1262. 



Chlamydotheca mexicana. 



(a) Side view, X 25; 



(6) First leg, X 100; 



ic) Furca, X laS- 



38 (39) Length about four mm, 



Herpetocypris barbatus 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. 



Fig. 1263. 

 Herpetocypris barbatus, (a) Side view with shell removed; (6) 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 b). 



Herpetocypris reptans Baird 1850. 



Length 2 .00 mm . to 2 .50 mm ., height 

 0.80 mm. Brownish yellow. Furca 

 about sixteen times as long as wide, 

 slightly curved; its dorsal edge armed 

 with five combs of coarse teeth. Furca 

 claws coarsely toothed. Muddy bot- 

 toms, ponds; April to September. 

 California. 



Fig. 1264. 



Herpetocypris reptans. (a) Side view; 



(I>) Furca. 



