6 BULLETIN OF THE LABORATORIES 



Additional locality : Lockland, O. Shallow, weedy, sluggish 



pool. 



Length of female 0.44 mm. — 0.54 mm. Height, 0.32 mm. — 



0.33 mm. 



Plenroxus hamattis, Birge. 



Pleuroxus haj?iatus, . . . E. A. Birge. Notes on Cladocera, 1878, 



pp. 22, 23; pi. IT, figs. 13, 14. 



Additional locality - Lockland, O. Sluggish, shallow, weedy 

 creek. 



Length of female of Lockland specimen, 0.5 mm. Height, 

 0.3 mm. 



Genus Chydorus, Leach. 



Chydorus sphaericus^ O. F. Miiller. 



Chydorus sphaericHs, . . . E. A. Birge. Notes on Cladocera, 1878, 



pp. 23, 34; pi II, fig. 19. 



Chydorus sphaericns, Baird, . . . S. A. Forbes. Some Lake Supe- 



rior Entomostraca, 1890, p. 7 2. 



Length of female, 0.5 mm. Height, 0.43 mm. 



Additional locality : Shallow, sluggish, grassy creek, Lockland. 



ORDER OSTRACODA 



Family CYPRIDID^. 



Genus Cypria, Zenker. 



Cypria inequivalva, sp. n. 



[Plate I; Figs, i, 8.] 



Shell inequivalve, one valve overlapping the other in front. 

 Valves glossy, finely pubescent. 



In fresh specimens, near the cephalic end of the shell, there is 

 an irregular cross shaped dorsal dark spot, [fig. i, 2], the arms of 

 which extend latero-ventrad along each valve for about one half the 

 height of the valve. Near the caudal extremity of the shell there is 

 another irregular dorsal dark spot. This spot is somewhat fan shaped, 

 with the expanded portion directed caudad. Occasionally, on the 

 ventral surface, about one third the length of the valve from the 

 cephalic extremity, a small dark spot is seen. In fresh ^specimens 

 these markings are very pronounced ; but in alcoholic specimens, 

 they are usually more or less obscured. 



Viewed from the side [fig. i] the shell is sub-reniform, higher 



