ORTMANN: UNIONID@ OF WESTERN PENNSYLVANIA. 206 
Many localities are known in Philadelphia County, in the Delaware 
and Schuylkill Rivers, and in ponds. It is found also in Delaware, 
Chester, and Lancaster Counties (Bruckhart, Gabb, Schick, Hart- 
man & Michener). It occurs also in York County, at York Furnace 
( Pilsbry ). 
There is a specimen from Crum Creek, Delaware County, in the 
Carnegie Museum, from the Hartman Collection, which was labeled 
implicata, but surely belongs to this species ; and two others from the 
Schuylkill River (same collection), which were labeled ¢~yon7 Lea. 
The present writer found this species in the Delaware River at Penn’s 
Manor, and in Little Neshaminy Creek, at Grenoble, Bucks County, 
and in Wissahickon Creek, at Roxboro, Philadelphia County. A 
dead shell was seen in the Raystown Branch of the Juniata River at 
Ardenheim, Huntingdon County. 
Dr. Atkinson collected-a splendid set of this species in Beaver Dam 
Creek, Flinton, Cambria County. ‘Thus this species goes in the Sus- 
quehanna drainage far to the west in the headwaters of the West Branch 
of the Susquehanna, and it is here as typically developed as in the 
neighborhood of Philadelphia. This is the more remarkable, as 4. 
grandis, which is closely allied to this species, appears right across 
the divide in the Ohio drainage in Indiana and Westmoreland Coun- 
ties (see above, p. 195). 
7. Anodonta implicata Say. 
Delaware and Schuylkill Rivers (Lea, Gabb, Hartmann & 
Michener). 
Typical specimens of this species were found by the writer in the 
Delaware River at Yardley, Bucks County. It has not yet been re- 
ported from the Susquehanna drainage. 
Simpson (1900, p. 641) cites 4. grands as doubtfully occurring in 
southeastern Pennsylvania, but I do not know on what authority. 
Pilsbry (Proceedings Philadelphia Academy, 1894, p. 30) gives 
** Anodonta subcylindrica Lea’’ (sic!) from York Furnace, York 
County. Ido not know what this stands for. <Avnodontoides ferus- 
sactanus subcylindraceus (Lea) is not found in the Atlantic drainage 
in Pennsylvania. 
8. Symphynota viridis (Conrad). 
Schuylkill River, Philadelphia (Conrad, Hartman & Michener); 
Lancaster, Lancaster County (Conrad, Lea); Lancaster County 
(Bruckhart); Juniata River (Conrad); Juniata River at Hollidays- 
burg, Blair County (Lea). 
