North American Fresfb-ivater Ostracoda. 463 



Claw of last segment of first pair of feet (Fig. 1) smooth 

 and slightly longer than the united lengths of the last 

 three segments; terminal segment conical, about as 

 long as wide; two segments preceding just equaling one 

 another; seta at inner distal angle of antepenultimate 

 segment as long as the penultimate segment. 



Last segment of second foot (Fig. 3) seven tenths as 

 wide as long and a fourth as long as the preceding seg- 

 ment; shorter backwardly directed seta half as long as 

 the longer one, or just equal to the last segment in 

 length; antepenultimate segment slightly shorter than 

 the penultimate, the seta at its inner distal angle as 

 long as that on the penultimate segment. The anterior 

 distal part of the penultimate segment has a crown of 

 cilia surrounding a short seta, and there are also sev- 

 eral clusters of coarse cilia on this and the antepenulti- 

 mate segments. 



Caudal rami (Fig. 2) bent, somewhat stout, and nine 

 times as long as wide, finely toothed along the inner 

 margin. Claws evenly bent, finely toothed, but more 

 coarsely so at middle; terminal claw three fifths as long- 

 as the ramus; subterminal one half as long as ramus. 

 Terminal seta of ramus three sevenths as long as the 

 subterminal claw; dorsal seta two thirds as long as the 

 terminal one and situated three times the width of the 

 ramus from the subterminal claw, or slightly beyond 

 middle of ramus. 



Described from a number of male and female speci- 

 mens taken at Havana, 111., August, 1895. 



Cypria dentifera, n. sp. (PI. XLVIL, Fig. 6-11.) 

 Shell .69 mm. long, .38 mm. high, and .26 mm. wide. 

 Entire surface smooth ; sparsely hairy except at each 

 end: brownish yellow, with dark brown markings 

 as follows: an anterior, a ventral, and a dorso- ventral 

 patch, and a vertical stripe dorsally just posterior to 

 the eye-spot. Muscle impressions in the form of a rosette, 

 closely clustered, six or seven in number (Fig. 6). 



