179 ANNALS OF THE CARNEGIE MUSEUM. 
This species is cited by Conrad from the ‘‘ Mahoning River, near 
Pittsburgh,’’ while Lea says: ‘* Mahoning River, Ohio.’’ The point 
of the Mahoning River nearest to Pittsburgh is where it joins the 
Shenango, thus forming the Beaver, near Mahoningtown, Lawrence 
County, about forty-five miles from Pittsburgh. The species is still 
present there, and I regard this part of the Mahoning River as the 
type-locanty. 
Unio viridis Conrad (Monogr., 4, 1836, and U. tappanianus Lea, 
Observ., II, 1838) = Symphynota viridis (Conrad). 
From the ‘‘ Juniata River,’’ according to Conrad, and from the 
‘« Juniata at Hollidaysburg (Blair Co.)’’ according to Lea. Although 
Unionidee have recently been collected at Hollidaysburg, this species 
is not among them. Nevertheless it is present in the Raystown 
3ranch of the Juniata River, and even farther west, in the head- 
waters of the West Branch of the Susquehanna in Indiana County. 
In 1891, E. H. Harn published a list of shells from western Penn- 
sylvania (Nautilus, 4, 1891, pp. 136-137). Harn was located at 
Blairsville, Indiana County, and apparently most of his Unionidze 
were from the Kiskiminetas. or the Conemaugh drainage. It is much 
to be regretted that this list does not give exact localities, since at 
present the fauna of the Kiskiminetas and its tributaries is almost com- 
pletely destroyed, only meager remains surviving in a few of the head- 
waters. 
Harn’s list is here submitted. All the species have recently been 
found in western Pennsylvania. The correct name according to the 
modern nomenclature is given. 
1. Unio esopus Green = Pleurobema esopus (Green). 
2. ‘¢ alatus Say = Proptera alata (Say). 
‘© circulus Lea = Odovaria circulus (Lea). 
‘© clavus Lamarck = Plewrobema clava (Lamarck). 
crassidens Lam. = Unio crassidens Lamarck. 
‘© cylindricus Say = Quadrula cylindrica (Say). 
‘¢ =gibbosus Barnes = Unio gtbbosus Barnes. 
8. ‘ fabalis Lea= Micromya fabalis (Lea). 
O.2 “Onis der Lampriis.472s- lees 
to.  ** kirtlandianus Lea = Quadrula subrotunda kirtlandiana 
(Lea). 
11. ‘* Jligamentinus Lamarck = Lampsilis ligamentina (Lamarck). 
I Aum &: W| 
