206 Annals of the Carnegie Museum. 



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 tryoni 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 A. 

 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 A. grandis 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. 1 do not know what this stands for. Anodontoides fenis- 

 sacianus 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 HoUidays- 

 burg, Blair County (Lea). 



