204 Annals of the Carnegie Museum. 



Bruckhart, H. G. Conchology in J. I. Mombert's " An authentic 



History of Lancaster County." 1869, p. 518. 

 Hartman, W. D., & Michener, E. " Conchologia Cestrica." 



1874. 

 Pilsbry, H. A. " Critical list of Mollusks collected in the Potomac 



Valley." (Proc. Acad. Philadelphia, 1894, p. 30.) 

 Schick, M, " Mollusk Fauna of Philadelphia and Environs." 

 (Nautilus, 8, 1895, p. 133.) 

 Also a few notes by other authors scattered through the literature. 



The Carnegie Museum collections of Atlantic species are chiefly 

 from the central parts of the state (Juniata and Susquehanna drainages), 

 and were made in 1908 by Dr. D. A. Atkinson and the present 

 writer. To these are to be added a few records of shells collected by 

 various persons in other parts of the state. 



1. Lampsilis cariosa (Say). 



Known from the Delaware, Schuylkill, and Susquehanna Rivers. 



The Carnegie Museum possesses specimens from the Delaware, at 

 Yardley, Bucks County (Ortmann), from the Susquehanna at York 

 Furnace, York County (Ortmann), and from Duncannon, Perry 

 County (Ortmann). The species is present in the Juniata River at 

 Juniata Bridge, Perry County (Ortmann), and at Lewistown, Mifflin 

 County (Ortmann), as far up as the Raystown Branch at Ardenheim 

 (Ortmann), and the Frankstown Branch at Huntingdon, Huntingdon 

 County (Atkinson). It exists also in the West Branch of the Susque- 

 hanna at Williamsport, Lycoming County (Atkinson). 



2. Lampsilis ochracea (Say). 



The Delaware, Schuylkill, and Susquehanna Rivers and Wissahickon 

 Creek, are the known localities of this species in the southeastern sec- 

 tion of the state. It is not represented by Pennsylvanian specimens 

 in the Carnegie Museum. 



3. Lampsilis radiata (Gmelin). 



It occurs in the Delaware, Schuylkill, and Susquehanna Rivers and 

 Wissahickon Creek. From the Susquehanna it has been reported as 

 far up as Muncy, Lycoming County (Dean, Nautilus, 5, 1891, p. 

 78). 



Specimens in the Carnegie Museum are from the Canal at Mana- 

 yunk, Philadelphia County (H. J. Gera) ; from the Delaware at 

 Yardley, Bucks County (Ortmann), and from the West Branch of the 

 Susquehanna at Williamsport, Lycoming County (Atkinson). 



I 



