4-60 Illinois State Laboratory of Natural History. 



Caudal rami stout, ending in two strong claws and 

 a seta; dorsal seta commonly situated about the mid- 

 dle of the dorsal margin. Copulative organ triangular. 



The members of this genus are all small and rather 

 compressed. There are eleven species, of which seven 

 are found in America. 



KKY TO SPECIES oF f'YPRIA. 



1 (8). Terminal setse of second feet approximately equal. 



2 (3). Terminal setae of second feet twice as long as 



the terminal segment. Leit valve with a dor.-al 

 flange; right valve with a row of tul)ei'cles anteriorly 

 and ventrally. C. pustulosa n. sp. 



3 (2). Terminal setae of second feet approximately as 



long as the terminal segment. 



4 (5). Terminal claw of caudal ramus half the length 



of the ramus. C. ophthalm:ca (Jurine). 



5 (4). Terminal claw of caudal ramus three fifths the 



length of the ramus. 



6 (7). Dorsal seta of caudal ramus rudimentar3\ shorter 



than width of ramus, situated at four times tlie 

 width of the ramus from the subtermiual claw, and 

 above the center; subterminal claw with a comb of 

 very long teeth beyond the center of the claw. 



C. DENTIFERA n. Sp. 



7 (6). Dorsal seta slender, two and a half times as long 



as ramus is wide, and two and a half times width 

 of ramus from subterminal claw, which is almost 

 smooth. Shell marked with closely set parallel and 

 anastomosing lines. C. exsculpta (S. Fischer). 



8 (1). Terminal setae of second feet plainly unequal, the 



shorter terminal seta being scarcelj^ longei- than the 

 segment and but half the length of the other simi- 

 larh' directed seta. Dorsal seta of ramus three times 

 width of ramus from subterminal claw. 



C. OBESA n, sp. 



