4Q4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Cypris fused Beady, Trans. Linn. Soc. London, XXVI, 1S6S, p. 3012, pi. xxin, 



figs. 10-15. 

 Cypris fuscata Brady and Norman, Trans. Royal Dublin Soc, IV, 2d ser., 



1889, p. 73, pi. xn, figs. 3—1. — Vavra, Arcbiv. Naturw. Durchforsch. 



Bohmen, VIII, Heft 3, 1891, p. 98.— Croneuerg, Bull. Soc. Imp. Xatur. 



Moscou, VIII. 1894, p. 30.",. fig. 22.— Sharps, Bull. Illinois State Lab. 



Xat. Hist.. IV, Art. 15, 1897, p. 442. pi. xliii, rig. 5.— (J. W. Mi'i.i.Ei:, 



Zoologiea, XII, Heft 30, 1900, p ; GO, pi. xvi, figs. 5-9.— Kaufmann, 



Revue Suisse de Zool., VIII. 1900, p. 270, pi. xv, figs. 14-16; pi. xvm, 



figs. 14-20. 



Dimensions. — Length. 1.48 to 1.45 mm.; breadth, 0.80 to 0.85 mm.; 

 height, 0.85 to 0.95 mm. Shell plain, not reticulate, and sparsely cov- 

 ered with small papillar elevations. 



Seen from above (figs. 2, 3), the shell is broadly ovate, breadth 

 being to length about as 5 is to 9, the greatest breadth lying just 

 behind the middle; left shell slightly overlapping the right. The 

 general color is dark green except in the region of the eyes. The 

 variety mi nor after Muller," in addition to showing the light patches 

 near region of the eyes, also shows similar patches just posterior 

 to the middle of the body and on the sides. This variety is some- 

 what smaller in all its dimensions. 



Seen from the side (fig. 1), the shell is decidedly humped just 

 back of the eye-spot, so as to form a noticeable angle when viewed in 

 exact profile. Extremities well rounded and ventral margin slightly 

 convex. 



Natatory seta? of the second antenna? reach about to the tips of the 

 terminal claws, long enough so that the animal is free swimming. 

 Terminal claw of first leg rather short, two-thirds of its length being- 

 shorter than the last three segments of the leg. while in Cypris r< ticu- 

 lata this is just reversed. Spines of the first maxillary process 

 toothed. 



Caudal ramus (W<z. 4) finely toothed on dorsal edge, long, slender, 

 weakly S-shaped to nearly straight, from 18 to 20 times as long as 

 wide: terminal claw very slender, finely toothed at tip, from one- 

 half to three-fifths as long as the ramus: subterminal claw two-thirds 

 as long as the terminal one. nearly straight: terminal seta weak, 

 about one-third as long as terminal claw: dorsal seta about width of 

 ramus from subterminal claw and about one-half as long as the 

 terminal seta. Propagation sexual. 



Both varieties, major and minor, were found in great abundance 

 in all the shallow grassy ponds or swamps southeast of Chicago. 

 Illinois, as far as Clarke Junction, Indiana. Most of them were col 

 lected during the month of Maw Scarcely a collection was made 

 during the month but contained both varieties and both sexes. 



" Zoologiea, XII. 1900, p. <',<;. 



