390 OHIO STATE ACADEMY OF SCIENCE. 



Obovaria circulus leibei (Lea, U. leibei). 

 Lake Erie. 



"Obovaria lens var. depygis, Conrad." 

 "Ohio," in check list, is unknown to me. 

 Obovaria ellipsis (Lea, Unio). 



Ohio River, common. 

 Obovaria retusa (Lamarck, Unio). 



Ohio River. 

 Cyprogenia irrorata (Lea, Unio). 



Ohio drainage: Ohio, Great Miami, Scioto, ^Tuscarawas, 



Mahoning Rivers. • 



Obliquaria reflexa Rafinesque, U. comutus Barnes. 



Both drainages, but not everywhere; Ohio, Scioto, and 

 Mahoning Rivers, not in the Tuscarawas ; Lake Erie (St.) 

 Pytchobranchus phaseolus (Hildreth, Unio). 



Both drainages, Lake Erie. 

 Tritogonia tuberculata (Barnes, Unio). 



Ohio drainage, generally. 

 Quadrula plicata (Say, Unio). 



Ohio and Little Miami Rivers. 

 Quadrula plicata hippopoea Lea. X 



Lake Erie. 

 Quadrula undulata (Barnes, Unio). 



Both drainages, generally common. 

 Quadrula heros (Say, Unio), U. mulliplicatus Lea. 



Ohio River, Little Miami River. 

 Quadrula cylindrica (Say, Unio). 



Ohio River and most or all of its tributaries. Some speci- 

 mens have none of the nodose projections, e. g. from 

 the Tuscarawas River. 

 Quadrula metanevra (Rafinesque, Obliquaria). 



Ohio River, common. 

 Quadrula metanevra wardii Lea. 



Ohio River; Sugar Creek, tributary to the Tuscarawas River 

 (St.), but not a trace of it was found in the River, nor 

 of typical metanevra in the river or creek. 

 Quadrula tuberculata (Rafinesque, Obliquaria). 



Ohio River; Little Miami River; Tuscarawas River (St.),. 

 large and heavy, often with regular transverse undula- 

 tions above the posterior umbonal ridge; Maumee and 

 • Tiffin Rivers, near Defiance (St.). 

 Quadrula granifera (Lea, Unio). 



Ohio River; tributaries? 

 Quadrula lachrymosa (Lea, Unio), U. asperrimus Lea. 



Both drainages, decidedly variable. The Lake Erie form is 

 little inflated and has few tubercles; a simliar form in 

 the Ohio Canal near Cleveland (Allen) ; not in the 

 Tuscarawas River. 



