MOLLUSCA OF OHIO. 391 
Quadrula fragosa (Conrad, Unio). 
Ohio River at Cincinnati, seems rare; Scioto River. 
Quadrula pustulosa (Lea, Unio). 
Ohio River and most of its tributaries; decidedly variable in 
regard to size, shape, and surface sculpture: from 
smooth to covered with tubercles all over.—A form 
from the lake drainage, e. g. the Tiffin River (St.), 1s 
considerably different from the high, coopertana-like 
form of the Ohio River and tributaries: more elongate, 
“quadrate,’’ approaching lachrymosa in outlines; the 
same is known from Michigan, Indiana (Kankakee 
River, St.), Illinois and Iowa (t. Walker), and seems to 
represent a variety, may be = schoolcrajtensis Lea. X 
Quadrula pustulosa kleineriana Lea. 
‘Entire Mississippi drainage; Lake Erie,”’ t. Simpson. 
Quadrula cooperiana (Lea, Unio). 
Ohio River; tributaries? 
Quadrula pustulata (Lea, Unio). 
Ohio River at Cincinnati; Mahoning River (Dean, Streator) ; 
cited from the Tuscarawas River, by Dean; I was not 
able to find a trace of it and suppose some form of 
pustulosa was mistaken for it. 
Quadrula subrotunda (Lea, Unio). 
Ohio River; Scioto River; Tuscarawas River, a form with 
very heavy shell, the beaks quite anterior, the shape of 
the mussel being much like that of P/. clava, the lines 
of growth coarse and markedly regular; a very small, 
slight form seems to be in Lake Erte. 
Quadrula kirtlandiana (Lea, Unio). 
Ohio River and some tributaries: Mahoning River, from 
which Lea had his types; Tuscarawas River, common 
and very variable, from the subrotunda form to much 
elongate, and some specimens much resembling (old) 
@sopus; one large and heavy specimen has numerous 
small muscle scars scattered all over the inner surface 
within the pallial line. It seems that kirtlandiana is 
doubtfully distinct from subrotunda, and half grown 
specimens agree with Lea’s description and figure of 
the last named species. 
Quadrula zsopus (Green, Unio). 
Ohio River and tributaries, Scioto, Mahoning, Tuscarawas. 
NoTEeE.—@sopus certainly ranges nearer the Quadrula of 
this group than with Pleurobema; it closely resembles 
kirtlandiana in features of the shell and soft parts. 
[Simpson himself was in doubt where to range this and 
the following species. ] 
