ENTOMOSTRACA OF MINNESOTA. 305 
Cypria exculpta S. Fischer. 
PLATES LXX, Fias. 1-8; LX XII, Fie. 3. 
1853.—Cypris elegantula Lilljeborg (118), p. 206. 
1854.— *‘  exculpta Fischer (65), p. 18; Pl. XIX, Figs. 36-38. 
1854.— ‘‘ puncetata Fischer (65), p. 77; Pl. III, Figs. 1-6. 
1864.— ‘‘  striolata Brady (11), p. 60; PI. III, Figs. 12-17. 
1868.— ‘‘  striolata Brady (18), p. 372; Pl. XXIV, Figs. 6-10. 
1880.— ‘* granulata Robertson (184), p. 18. 
1887.— ‘ — striolata C. L. Herrick (86), p. 29; Pl. LV, Fig 3. 
1889.—Cypria exculpia Brady and Norman (31), pp. 68-69; Pl. XI, Figs. 1-4. 
1894.— ‘  exculpta C. H. Turner (215), p. 13; Pl. VII, Figs. 2-8. 
1894.— “  exculptaC. H. Turner (216), p. —. 
Length of female 0.54 to 0.64 mm. Height 0.33 to 0.43 mm. Width 
0.26 mm. 
The shell is thin and somewhat transparent and is covered with a 
meshwork of sub longitudinal lines (Fig. 5). 
Viewed from the side (Fig. 3), the shell is orbicular, highest in the 
middle, the two extremities being of about equal height. The cepha- 
lic, dorsal and caudal margins are convex. The ventral margin is 
slightly sinuate, being concave in the middle. 
Viewed from above the shell is an elongated, laterally-compressed 
ellipse. The two extremities are of about the same width and the 
line of contact is straight. 
The natatory sete of the antenne (Fig. 6) extend far beyond the 
terminal claws and are much longer than the entire limb. The claws 
on the tip of each antenna are long and slender. They are longer 
than the last three joints. 
In the male the second maxille (Fig.8) are dissimilar. 
The tip of the second foot (Fig. 2) bears two short ectally project- 
ing sete and two long sete which project backwards as far as the base 
of the antepenultimate joint. 
The post-abdomen (Fig. 7) is short, stout and curved. The ter- 
minal claw is strong and about half as long as the ramus. About the 
middle of the caudal margin of each abdominal ramus there is a short 
filamentous seta. 
Habitat: This species is quite abundant in shallow ponds and 
slowly flowing shallow creeks. 
In America this species has been found at: Atlanta, Georgia 
(Turner, 215); Burlington, Ohio (Turner, 215); Alabama (Herrick, 
86); Kent County, Delaware (Turner, 215); Fayette County, Georgia 
(Turner). The specimens from Delaware were collected for me by 
Mr. L. D. Hileland. 
