North American Fresh-ioater Ostracoda. 435 



penultimate segment in the female is armed with three 

 claws distallj, the outer of which is but a third as long 

 as the other two and a half longer than the last seg- 

 ment. Claws four times as long as the distal segment, 

 which is half as wide as long. 



The tw^o segmented spines on the first pair of maxillae 

 are toothed. 



Terminal claw of first pair of feet (Fig. 4) strong, finely 

 cross-toothed near the extremity, and slightly longer 

 than the last three segments, of which the penultimate 

 and antepenultimate are of the same length, both to- 

 gether just equaling the one preceding. This segment has 

 five patches of fine hairs (Fig. 4) on the inner edge, and 

 a moderately long seta at the inner distal angle. Outer 

 edge slightly crenulate. 



Terminal claw of second pair of feet (Fig. 5) nearly 

 straight, finely cross-striated and finely toothed, scarcely 

 longer than terminal segment of foot. 



Caudal rami (Fig. 6) slightly bent, about twice as 

 long as the terminal claw. Claws finely toothed, strong, 

 slightly bent, the shorter three fourths the length of the 

 longer. Dorsal seta of ramus width of ramus from sub- 

 terminal claw, bent, somewhat coarsely plumose, and as 

 long as the subterminal claw, which is situated at width 

 of ramus from terminal claw; terminal seta three fifths 

 the length of dorsal one. 



Shaded roadside pool near Havana, 111. (abundant) ; 

 Cedar Creek, uear Quincy, 111. (Coll. 111. State Lab. Nat. 

 Hist.) ; April, 1896, in an aquarium started from a small 

 creek flowing through the University arboretum at 

 Urban a. 111. 



Cyprinotus burlingtonensis Turner. (PI. XLII., 

 Fig. 7.) 



1894. Cypris burlingtonensis, Turner (64, p. 17, PI. YII., Fig. 14- 



"23). 



1895. Cyprinotus burlingtonensis, Turner (35, p. 333, PI. LXX., 



Fig. 14-23). 



