THE OSTRACODA 



821 



84 (83) Shell plain, with small puncta. Abdomen with two cylindrical 

 processes Cypria (Cypria) opthalmica Jurine 1820. 



Length 0.56 to 0.60 mm., height 0.36 to 0.40 

 mm., width 0.3 2 to 0.36 mm. Shell compressed, 

 clear brown, with dark-brown patches ante- 

 riorly and posteriorly and just back of eye-spot. 

 Natatory setae very long, reaching beyond 

 terminal claws by more than the entire length 

 of the antenna. Furca about eight times as 

 long as wide. Surface and 'bottom tows in 

 river channels and lakes, and their shores; 

 February to October. Also common in ponds 

 and ditches where there is Httle or no vegeta- 

 tion. Georgia, Ilhnois, Minnesota, Oregon. 



Fig. 1284. 

 Cypria {Cypria] opthalmica. {a) Side view, X 49: 

 (b) Dorsal view; (c) Furca, X I37i; id) Penis, 

 X 100. 



85 (86) Shell clear to brownish yellow, with a few scattered puncta. 



Cypria {Cypria) obesa Sharpe 1897. 



Length 0.78 mm., height 0.48 mm., width 

 0.33 mm. Plump. Furca bent, about nine 

 times as long as wide, its dorsal seta three 

 times width of ramus from subterminal claw, 

 and as long as the terminal seta. Males com- 

 mon. In tow of sandy lake shore; May. 

 Illinois. 



Fig. 1285. 

 Cypria (Cypria) obesa. (a) Dorsal view, X 45: 



(b) Furca; (c) Maxillary palps of male; (d) Second 



leg. 



86 (85) Shell white, smooth, and shining, with numerous almost confluent 

 puncta Cypria (Cypria) mons Chambers 1877. 



Q 



Length 0.70 mm. A doubtful form, not well described. 

 Colorado, Mt. Elbert. Altitude 11,000 feet. 



Fig. 1286. 

 Cypria (Cypria) mons. (a) Dorsal view; (6) Side view, X 16. 

 (After Chambers.) 



87 (88) Left shell higher than right. Terminal short setae of second leg 

 about twice as long as the terminal segment (Fig. 1287). 



Cypria (Physocypria) pustulosa Sharpe 1897. 



Length 0.51 mm., height 0.39 mm., width 

 0.22 mm. Clear brownish with dark patches. 

 Extremities of shell hairy. A decided dorsal 

 flange on left valve (Fig. 1287 a). Natatory 

 setae three times as long as the distance be- 

 tween the place of their insertion and tips of 

 terminal claws. Furca two and two-fifths 

 length of terminal claw. Dorsal seta weak and 

 situated about middle of furca. Bottom tows 

 in river channels, surface and bottom tows in 

 lakes, and lake and river shores; April to 

 September. Illinois. 



Fig. 1287. 

 Cypria (Physocypria) pustulosa. (a) Left valve, X 

 36; (b) Right valve; (c) First leg; (d) Furca; 

 («) Second leg. 



