MOLLUSCA OF OHIO. 389 



Lampsilis ligamentina gibbus Simpson. 



Ohio River. 

 Lampsilis orbiculata (Hildreth, Unio). X 



Ohio River and probably some of its tributaries. 

 Lampsilis higginsii (Lea, Unio) is considered a variety of 

 orbiculata, by some conchologists ; I have not seen it 

 from Ohio. X 

 Lampsilis anodontoides (Lea, Unio). 



Ohio River; Great Miami River (large). 

 t Lampsilis fallaciosa (Smith) Simpson. X 



Ohio River at Cincinnati (St.), and probably at other places. 

 Lampsilis recta (Lamarck, Unio). 



Both drainages; Lake Erie (small); not in the Mahoning 

 River, t. Dean. 

 Lampsilis nasuta (Say, Unio). 



St. Lawrence drainage, Lake Erie; probably also in the 

 Ohio drainage, at least along the divide. In Muzzy 

 Pond, near Rootstown, Portage Co., specimens were 

 found (St.), to 118 mill, long, the largest of any known, 

 t. Simpson. 

 Lampsilis subrostrata (Say, Unio). X 



"Ohio;" I have seen no sepcimens (although it is doubtless 

 at least in the north-western part of the state). 

 Lampsilis iris (Lea, Unio). L. Novi Eboraci Lea = syn. or var.? 



Both drainages; Lake Erie (St.). 

 Lampsilis ellipsiformis (Conrad, Unio), U. spatulatus Lea. 



Ohio River. 

 Lampsilis glans (Lea, Unio). 



Both drainages; Ohio River; Maumee and Auglaize Rivers 

 (St.) ; not in the Tuscarawas River. 

 Lampsilis parva (Barnes, Unio). 



Over the state (both drainages, Lake Erie); rivers, creeks 

 and canals. 

 Plagiola securis (Lea, Unio); Obovaria lineolata Rafinesquc"- 



Ohio River. 

 Plagiola elegans (Lea, Unio). 



Both drainages; Ohio and Little Miami Rivers; Maumee and 

 Tiffin Rivers (St.); Lake Erie (Prof. Moseley. St J ; not 

 in the Tuscarawas River. 

 Plagiola donaciformis (Lea, Unio), U. zigzag Lea. 



Both drainages, Lake Erie. 

 Obovaria circulus (Lea, Unio). 



Over the state. So far as evidence goes, U. lens Lea is the 

 female form, circulus the male, the latter generallv 

 much the larger.* 



* These male and female forms are much more different from each 

 other in shape, than those of ellipsis, and of retusa. 



