388 OHIO STATE ACADEMY OF SCIENCE. 



PELECYPODA. 



UNIONID^E. 



Truncilla triquetra Rafinesque. 



Both drainages, Lake Erie. 

 Truncilla sulcata (Lea, Unio), U. ri Jibuti Jus Say = female. X 



Ohio River. 

 Truncilla sulcata delicata Simpson. X 



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, occiJens 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). X 



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 DeKay. 



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 ? 



