ORTMANN: UNIONID® OF WESTERN PENNSYLVANIA. 204 
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). 
