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MOLLUSCA OF OHIO. 
Lampsilis ligamentina gibbus Simpson. 
Ohio River. 
Lampsilis orbiculata (Hildreth, Unio). 
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). 
;+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 
Rover,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). 
‘“‘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 Eboract 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 Rafinesque ?) 
Ohio River. 
Plagiola elegans (Lea, Unio). 
Both drainages; Ohio and Little Miami Rivers; Maumee and 
Tiffin Rivers (St.); Lake Erie (Prof. Moseley, 5t.); 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 generally 
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* These male and female forms are much more different from each 
other in shape, than those of ellipsis, and of retusa. 
