24 PROCEEDINGS OF THE ACADEMY OF [1894. 



Co., West Virginia, 64,808. Found by Mr. Stone at York Furnace, 

 York Co., Pa., where L. huviilis Say, L. columella Say and L. 

 caperata Say also occur. 



Subfamily Planorbinse. 



Genus PLANORBIS Guet. 

 P. trivolvis Say. 



Canal at Hancock, ^Nld., 64,800, also York Furnace, York Co., 

 Pa. (Stone). 



P. bicarinatus Say. 



Gettysburg, Pa., 64,795. Conecochegue River, Md., 64,798. 

 Potomac R., at Hancock, Md., 64,794. Flintstone Creek, Flint- 

 stone, Md., 64,788. Evitts' Creek, near Cumberland, Md., 64,793. 

 Cumberland, Md., 64,792. Patterson Creek, Mineral Co., W. Va., 

 64,791. S. Branch Potomac R. , 4 miles from Romney, W. Va., 

 64,797. Warm Spring Creek, Morgan Co., W. Va., opposite 

 Hancock, 64,796. North River, Sedan, Hampshire Co., W. Va., 

 64,790. Potomac River at Cherry Run, W. Va., 64,789. South 

 Fork Shenandoah River, near Luray, Va., 64,799. Also York 

 Furnace Pa. (Stone). 



Throughout this region P. bivaruuttiis and Fhijsa heterostropha 

 are ubiquitous aquatic species. 



P. parvus Say. 



Canal at Hancock, ^Id., 64,801. Also York Furnace, Pa. 

 (Stone), with Segment !)ia ((.rmigera, Say. 



Subfamily Ancylinse. 



Genus ANCYLUS Goeff. 

 A. rivularis Say. 



Piny Creek, Gettysburg; Pa., 64,804. Between (rrcen and 

 Polish Mts., Allegheny Co., Md., 64,805. Warm Spring Creek, 

 Morgan Co., W. Va.,64,806. 



Family PHYSIDvE. 

 Genus PHYSA Drap. 



P. heterostropha Say. 



Gettysburg, Pa., 64,814. Conecocheague River, Washington 



