18 PROCEEDINGS OF THE ACADEMY OF [1894. 



The southeastei'u limit of distributiou of this species is still to be 

 mapped. 



P. perspectiva Say. 



Cumberland, Md., 64,702. Morgan Co., W. Va,, opposite Han- 

 cock, 64,701. The specimens from Cumberland are uncommonly 

 coarse- ribbed. INIorgau County is probably the eastern limit of dis- 

 tribution for this species. 



P. lineata Say. 



Gettysburg, Adams Co. , Pa. , 64, 705. Monterey, Franklin Co., Pa., 

 64,704. 



Family HELICIDJE. 

 Genus POLYGYRA (Say 1818) Pils. 1889. 



Poh/gyra Say, 1818 -)- Memhv Raf., 1881, -f Stenotrevia and 



Triodopsis Rafinesque, 1811*. 

 Neohelix v. Ihering, 1892. 



P. hirsuta Say. 



The specimens from this region are all small, measuring from 6 to 

 6 -5 mm. diameter, and 4 to 4 -5 mm. height. Monterey, Franklin 

 Co., Pa., 64,731. Cave Town, Wash. Co., Md., 64,732. Summit 

 of North Mountain, west of Clear Spring, Washington Co., Md., 

 64,729. Martin's Mountain, 64,730. Between Green and Polish 

 Mts., 64,726. Cumberland, Allegheny Co., Md., 64,724. Mor- 

 gan Co., W. Va., opposite Hancock, 64,728. Found ])y Stone at 

 York Furnace, York Co. , Pa. 



P. monodon Rackett. 



Gettysburg, Adams Co., Pa., 64,739. Monterey, Franklin Co., 

 Pa., 64,740. Cave Town, Washington Co., IsU., 64,738. Between 

 Green and Polish Mts., Md., 64,726. Martin's Mountain, 64,736. 

 Cumberland, Md., 64,735. Morgan Co., W.Va., opposite Hancock, 

 64,737. The specimens from Pennsylvania would fall under the 

 "variety" fntternu, having the undjilicus wholly closed. This 

 species was collected by Stone at York Furnace, York Co., Pa. 



P. thyroides Say. 



Ten miles west of Hancock, Md., 64,712. West Va., opposite 

 Hancock. Cund)erlaud, INId., 64,711, abundant. Like Philadel- 



