388 OHIO STATE ACADEMY OF SCIENCE. 
PELECYPODA. 
UNIONID#@. 
Truncilla triquetra Rafinesque. 
Both drainages, Lake Erie. 
Truncilla sulcata (Lea, Unio), U. ridibundus Say = female. 
Ohio River. 
Truncilla sulcata delicata Simpson. 
Lake Erie drainage—? 
Truncilla foliata (Hildreth, Unio). x 
Ohio River, Cincinnati. 
Truncilla personata (Say, Unio), U. pileus Lea. X 
Ohio River — and tributaries? 
Trincilla perplexa (Lea, Unio). 
Ohio River; Scioto River. 
Truncilla perplexa rangiana Lea. 
Ohio, Scioto, Tuscarawas, Mahoning Rivers. 
Truncilla perplexa cincinnatiensis Lea. 
Ohio River at Cincinnati. 
Micromya fabials (Lea, Unio), U. lapillus Say. 
Both drainages; in nearly all rivers. 
Lampsilis ventricosa (Barnes, Unio), U. subovatus Lea is the 
male form, occidens Lea, the female. 
Over the state, decidedly variable; common in Lake Erie, 
very small to medium sized, of somewhat peculiar 
shape and appearance, representing a variety. 
Lampsilis capax (Green, Unio). 
Ohio River. 
Lampsilis ovata (Say, Unio). 
Ohio River; Great Miami River (Walker). 
Lampsilis multiradiata (Lea, Unio). 
Both drainages, over the state. 
Lampsilis luteola (Lamarck, Unio). 
Over the state, common and variable; common in Lake 
Erie and decidedly variable, some forms being very 
small. 
Lampsilis luteola rosacea DekKay. 
Lake Erie. 
Lampsilis radiata (Gmelin, Mya). x 
St. Lawrence drainage; Portage River! (Oberlin collection). 
Lampsilis ligamentina (Lamarck, Unio). 
Both drainages, generally common; abundant e. g. in the 
Tuscarawas River, large and much inflated. Not in 
- the Mahoning River, t. Dean ? 
