8,7 



THE OSTRACODA 



6i (60) Shell reticulated, thin, the spermarics showing through. I 



Cypris {Cyprnwtus) crnid Tu: 



0.6s mm., width o.sgt<.oy« mm N "'..•;... 



lary spmcs smocuh. l-„urll, m-kuh-u- 

 extra short spines, l-urca i urvtnl . 



ponds and canal basins. Ohio. ««i*« wrruy 



Cypris (Cyprinotus) crena. (a) SidJ tiew. X 15; (*) Furca ol mtk. 



62 (63) Furca normal, with two spines and two setae (Fig. W7S</) 



Subgenus Cyprii 



63 (62) Furca abnormal, the terminal seta missing (Fig. ii^c). 



Paracypris .W-w Subgenus 



H 



66 



64 (65) Both spines of first maxillary process smooth 



65 (64) Both spines of first maxillary process toothed (Fig. i 270 r;. 



66 (67) Shell bluish black, with two yellowish areas in region of eye spot 



(Fig. 1275 a) Cypris {Cypris) virais ]\inx\i: \^20. 



Length 1.70 to 2.00 mm., height 0.90 to i.oo mm. Shell coverctl with short ! ur> x'\\ 

 left valve slightly overlapping the right. Ventral edge flanged antoriorlv N.f 

 reach to tips of terminal claws. Dark to yellowish green. Furca weakly s'shajir. 



and from eighteen to twenty times as long as average width, and its dorsal mar^ ...-.w. 



Very variable. Weedy ponds; April to July. Massachusetts. Mexico. Ohio. Wiscoosm. 



Fig. 1275- 

 Cypris (Cypris) virens. (a) Side view. X i8; (6) Dorsal view; (c) Furca. 



67 (66) Shell bright, deep green, smooth, with minute punctures. 



Cypris {Cypris) iiUissinui C'haml)crs 1877. 



,_ Length 0.80 mm., height 040 mm. I 



^ two terminal claws nearly same Irn^'th i 



ing snow, Mt. Libert. C'olora<lo. .\llit 



Fig. ii76. Cypris (Cypris) aUistimt Kurca. 



6S (69) Terminal three segments of first leg longer than two-lhirdi of il* 



terminal claw (Fig. 1277/)) • • 1^ 



69 (68) Terminal three segments of first leg shorter than two-lhinls of lU 



terminal claw 7' 



