76 REPORT OF NEW JERSEY STATE MUSEUM. 



quite narrow posterior extremity. Ventral edg-e nearly straight, 

 slig-htly sinuate just posterior to middle. Viewed from above 

 shell tumid, oval, widest in middle, tapers somewhat more rap- 

 idly anteriorly. Dark dorsal coloration appearing in form of 

 rough cross. Longest of natatory set?e reach but slightly beyond 

 terminal claws. First pair oi maxillae slender, weakly developed, 

 and spines in its tirst process toothed. Second foot long', slender, 

 terminal claws covered, slender, twice as long as terminal seg- 

 ment. Caudal rami straight, weakly bent near end, from' ten to 

 twelve times long- as wide, and very faintly toothed on dorsal 

 edge. Terminal claw slender, straight, finely toothed at extrem- 

 ity, nearly three-fifths long as ramus. Sub-terminal claw five- 

 sevenths long as terminal claw, straight. Terminal seta slender, 

 short, of same length as dorsal one, which one-third length of 

 sub-terminal claw and distant from it width of ramus. Color 

 clear yellowish to translucent, with dark blue patch dorsally and 

 just posterior to eye-spot. Strikingly sculptured form of shell 

 especially noticeable in young stages. This sculpturing resembles 

 striations at center of shell, changing to radially arranged pat- 

 terns, resembling filagree work. Occasionally in old specimens 

 this absent. Length 1.25 mm. (Sharpe.) 



Remarks. — Known fromi Ne^^- Jersey b}- Sharpe's record. It 

 occurs mostly in northern Europe and lives in small grassy pools. 



Siib-Fainily Cyclocypridin.e. 



Natatory setse very long, usually twice as long as distance from 

 their origin to tips of end claws. Second feet with three set?e, 

 one long, the other two rather short and backwardly directed. 

 Furca usually normal. 



Key to the genera. 



a. Terminal segment of second pair of feet two-thirds long as fourth 



segment. cyclocypris 



aa. Terminal segment of second pair of feet one- fourth as long as fourth 



segment. cypria 



