THE OSTRACODA 



819 



73 (74) Posterior margin of furca pectinate (Fig. 1280 c). 



Cypris (Paracypris} perelegans Herrick 1887. 



Length 3.60 mm., height 1.72 mm., width 1.40 

 mm. Color clear pale yellow, with a sigmoid 

 pattern in clear brown. Seen from above, the 

 shell is acutely wedge-shaped anteriorly. From 

 the side the upper and lower margins are nearly 

 parallel, with a large projecting tooth postero- 

 ventrally. Terminal segment of second leg with 

 two small claws and one seta. Dorsal seta 

 spine-like. Weedy ponds. Alabama. 



FIG. 1280. 



Cypris (Paracypris) perelegans. (a) Side view, X 9; 

 ^^ (b) Dorsal view; (c) Furca. 



Posterior margin of furca plain (Fig. 1281 c). 



Cypris (Paracypris) grandis Chambers 1877. 



74 (73) 



a 



Length 3.60 mm., height 2.09 mm., width 1.39 

 mm. From above, shell regularly elliptical. 

 Bluish white to pale greenish. Ponds along the 

 Arkansas River, Colorado. Altitude 8000 feet. 

 A doubtful form. 



FIG. 1281. 



Cypris (Paracypris) grandis. (a) Side view, X 4; 

 (6) Dorsal view; (c) Furca; (d) Maxillary palps 

 of male. (After Chambers.) 



75 (76) Terminal segment of second leg small, with two short claws, and a 

 long reflexed seta (Fig. 1282 d). Second antenna of male 

 with two sense organs on fourth segment. 



Cypria Zenker 1854 . . 77 



76 (75) Terminal segment of second leg long and narrow, with short claw, 

 and two long reflexed setae (Fig. 1290 /). Second antenna 

 of male without sense organs on the fourth segment. 



Cydocypris Brady and Norman 1889 . . 89 



77 (78) Right-valve margin not crenulate anteriorly. Valves about the 

 same size (Fig. 1284 a-b). . . . Subgenus Cypria . . 79 



78 (77) Right-valve margin crenulate anteriorly. Valves of decidedly differ- 

 ent sizes (Fig. 1287 a-b). 



Subgenus Physocypria Vavra 1891 . . 87 



79 (80) Terminal claws of second leg approximately equal (Fig. 1 282 <f) . . 8 1 



80 (79) Terminal claws of second leg evidently unequal (Fig. 1285 </)... 85 



