ENTOMOSTRACA OF MINNESOTA. 305 



Cypria exculpta S. Fischer. 



Plates LXX, Figs. 1-8; LXXII, Fig. 3. 



1853.— C^i^m eleganiula Lilljeborg (118), p. 2C6. 



1854.— •' exculpta Fischer (65), p. 18; PI. XIX, Figs. 36-38. 



1854.— " punctata Fischer (65), p. 77; PI. Ill, Figs. 1-6. 



1864.— " .s«no/rt<« Brady (11), p. 60; PI. Ill, Figs. 12-17. 



1868.— " siriohtta Brady (18), p. 372; PI. XXIV, Figs. 6-10. 



1880.— " granulata Robertson (184), p. 18. 



1887.— " striolata C. L. Herriik (86), p. 29; PI. IV, Fig 3. 



1889.— CypriM exculpta Brady and Norman (31), pp. 68-69; PI. XI, Figs. 1-4. 



1894.— '■ * exculpta C. H. Turner (215), p. 13; Pi. VII, Figs. 2-8. 



1894.— " exculpta C. 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 sel?e of the antennae (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 maxillse (Fig.8) are dissimilar. 



The tip of the second foot (Fig. 2) bears two short ectally project- 

 ing setfe and two long setae 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. 



