North American Fresh^water Ostracoda. 451 



Ostracoda. Terminal claw a fourth longer than the sub- 

 terminal one, and nearly- half the length of ramus ; both 

 faintly toothed, the subterminal one more prominently 

 so along the middle. Dorsal seta plainly plumose, about 

 as long as the shorter claw, situated at two thirds the 

 length of seta, or two and a half times the width of ra- 

 mus, from subterminal claw; terminal seta half the 

 length of the dorsal one. 



This species occurs in the San Antonio River, Texas 

 (Turner), and the specimens belonging to the Illinois 

 State Laboratory of Natural History, mentioned above, 

 were collected from ponds at Chfton, 111., May 12, 1882. 



Candona recticauda n. sp. (PI. XLVI., Fig. 7-11.) 



Shell of male 1.18 mm. long and .70 mm. high, stout, 

 covered with scattered papillar elevations, the sper- 

 matozoa, as is usual, showing through as four 

 bands. 



Second antennae of male (Fig. 8) stout, six-segmented, 

 terminal segment two thirds as wide as long, the pre- 

 ceding segment as wide as long. The longer of the two 

 male "sense organs" on the antepenultimate segment 

 reaches beyond the tip of the terminal segment by the 

 length of the hyaline tip, the shorter one reaching to 

 the tip of the segment. Terminal claws as long as the 

 antepenultimate segment and faintly toothed near the 

 middle. 



Palp of left second maxilla of male (Fig. 10) elongate, 

 round, bent at tip, ending in a sharp hyaline point; two 

 rather long blunt setse at point of curvature, reaching 

 three fifths the distance to the end of the palp. Kight 

 palp of male (Fig. 9) round, thick, shghtly bent, ending 

 in a sharp hyaline point, with two short blunt setae on 

 its concave side reaching two thirds the distance to the 

 tip of the palp. 



Terminal claw of first foot one and a half times as 

 long as the last three segments; terminal segment 



