444 Illinois State Lahoratory of Natural History. 



Cypris testudinaria n. sp. (PI. XLIV., Fig. 1-4.) 



This species is 1.15 mm. loug, .74 mm. high, and .65 

 mm. wide. Shell very thin, dirty brown to ochreous, 

 and in all tlie specimens seen of a leathery flexible con- 

 bistency, as if composed mostly of animal matter. Indeed, 

 the shell might be rolled like parchment— a peculiarity 

 not known To me as belonging to any other species of 

 ( )straeoda. It is rather thickly covered with short hairs, 

 and there is also a thick marginal I'ow. 



Seen from the side, the shell is rather nari-ower an- 

 teriorly than posteriorly, elongate-elliptical in outline, 

 the ventral margin somewhat straighter than the dorsal. 



Natatory setae of the second antennse (Fig. 4) 

 short, simple, just reaching the tips of the termi- 

 nal claws. The terminal claws are straight, moder- 

 ately stout, hooked at tips, finely toothed, and as long 

 as the last three segments. Terminal segment twice as 

 long as wide, one fifth as long as the penultimate, which 

 is seven eighths as long as the antepenultimate; ante- 

 penultimate segment a little more than three and a half 

 times as long as wide, the sense club short, nearly 

 straight, situated just below the middle of the segment. 

 There is a crown of cilia at the base of the natatory 

 setae, extending to the inner apical edge of the segment. 

 The spines of the first process of the second maxillae 

 are toothed. 



Claw of first foot (Pig. 2) bent, rather stout, lightly 

 toothed, and one sixth longer than the last three 

 segments combined. The last segment is as wide as 

 long, the outer of the two terminal setae being twice as 

 long as the segment. The fourth segment from the last 

 commonly has a crown of setae near its base, besides 

 scattered marginal ones. 



Terminal claw of second foot about a third the 

 length of the terminal segment, which is one seventh as 

 long as the penultimate segment. The reflexed seta of 

 the terminal segment is half the length of the penulti- 

 mate seft-ment. 



