Ortmann : Unionid^ of Western Pennsylvania. 207 



There are specimens in the Carnegie Museum from the Schuylkill 

 Canal at Manayunk, Philadelphia County (H. J. Gera); the Dela- 

 ware River, Yardley, Bucks County (Ortmann); Raystown Branch 

 of the Juniata River, Bedford, Bedford County (A. Koenig); Cush- 

 Cushion Creek, Green Township, Indiana County (Atkinson). 



9. Alasmidonta undulata (Say). 



The species is reported from the Delaware and Schuylkill Rivers 

 (Say, Gabb) ; and several smaller streams in Bucks, Philadelphia, 

 Delaware, Montgomery, Chester, and Lancaster Counties (Schick, 

 Gabb, Hartman & Michener, Bruckhart). Harn gives this species for 

 " western Pennsylvania" (see above). 



A large specimen from the Hartman collection, labeled " Kimber- 

 ton Dam, Chester County" is in the Carnegie Museum. There are 

 also specimens from the Schuykill Canal, Manayunk, Philadelphia 

 County (H. J. Gera) ; Delaware River, Yardley, Bucks County (Ort- 

 mann) ; West Branch Mahan tango Creek, Richfield, Juniata County 

 (Atkinson) ; Raystown Branch of the Juniata River, Everett, Bed- 

 ford County (P. E. Nordgren) ; Shober's Run, Bedford Springs, Bed- 

 ford County (A. Koenig) ; Frankstown Branch of the Juniata River, 

 HoUidaysburg, Blair County (Ortmann) ; Beaver Dam Creek, Flin- 

 ton, Cambria County (Atkinson) ; Swartz Run, Ashville, Cambria 

 County (Ortmann). 



10. Alasmidonta (Pressodonta) hetorodon (Lea). 



Schuylkill River, Darby Creek, (Lea, Gabb, Conrad, Hartman & 

 Michener) ; Neshaminy Creek, Bucks County (Schick) ; Canal at 

 Manayunk (Schick). 



There is in the Carnegie Museum only a single individual from the 

 last named locality (H. J. Gera coll.). 



11. Alasmidonta (Rugifera) marginata varicosa (Lamarck). 

 Schuylkill River, Philadelphia (Lamarck) ; small creeks in Bucks, 



Delaware, and Chester Counties (Schick, Hartman & Michener) ; 

 Lancaster County (Bruckhart). 



There are specimens in the Carnegie Musuem from the following 

 localities: Lehigh River, Bethlehem, Northampton County (Holland 

 Collection) ; Delaware River, Yardley, Bucks County (Ortmann) ; 

 Susquehanna River, Duncannon, Perry County (Ortmann) ; Juniata 

 River, Juniata Bridge, Perry County (Ortmann) ; Frankstown Branch 

 of the Juniata River, Huntingdon and Alexandria, Huntingdon County 

 (Atkinson) ; Raystown Branch of the Juniata River, Ardenheim, 



