264 MEMOIRS OF THE CARNEGIE MUSEUM. 



Pymatuning Creek, Pymatuning Townsliip, Mercer Co. 



Allegheny River, Walnut Bend, Venango Co. 



Crooked Creek, Rosston, Armstrong Co. 



French Creek, Utica, Venango Co.; Meadville, Crawford Co. 



Connewango River, Russell, Warren Co. 



Other localities represented in the Carnegie Museum: 



Lake-drainage: 

 Lake Erie, La Plaisance Bay, Monroe Co., Michigan (C. Goodrich). 

 Sandusky River, Upper Sandusky, Wyandot Co., Ohio (C. Goodrich). 

 Swan Creek, Toledo, Lucas Co., Ohio (C. Goodrich). 

 Maumee River, Fort Wayne, Allen Co., Indiana (C. Goodrich). 



Ohio-drai7iage : 

 Tuscarawas River, Ohio (Holland collection). 

 Ohio Canal, Columbus, Franklin Co., Ohio (Smith collection). 



West Fork River, Lynch Mines, Harrison Co.; Lightburn and Weston, Lewis Co., West Virginia. 

 Elk River, Clay, Clay Co., West Virginia. 



Tennessee-drainage : 

 Holston River, Mascot, Knox Co.; Noeton, Grainger Co.; Church Hill, Hawkins Co., Tennessee. 

 South Fork Holston River, Pactolus, Sullivan Co., Tennessee. 



North Fork Holston River, Rotherwood, Hawkins Co., Tennessee; Hilton, Scott Co., Virginia. 

 Clinch River, Clinch River Station, Claiborne Co., Tennessee; Speers Ferry, Scott Co., Virginia; St. 



Paul, Wise Co., Virginia; Cleveland, Russell Co., Virginia. 

 Powell River, Combs, Claiborne Co., Tennessee. 



Distribution and Ecology in Pennsylvania (See fig. 27) : This is a rather rare 

 and local shell in western Pennsylvania, and has been found chiefly in small streams 

 in small numbers. It has never turned up in the Monongahela-drainage in our 

 state, but it is in the headwaters in West Virginia (West Fork River). Probably 

 the species is more abundant than the records show, but is often overlooked, or 

 not hunted for at the proper places. I found it in and near riffles, generaUy in 

 patches of Dianthera americana, or among other water weeds {Heter anther a, in 

 the upper Allegheny, or Potamogeton, Vallisneria, etc.). According to observa- 

 tions made in West Virginia it distinctly prefers these plants, in riffles, and is 

 deeply buried in the sand and gravel bound together by their roots and rhizomes. 

 By pulling up the plants it sometimes was brought to light in goodly numbers. 



General distribution: Type locality, Ohio (Lea). This species belongs to the 

 Ohio-drainage, and from this it has crossed over into the lake-drainage in south- 

 eastern Michigan and northern Ohio (Conrad, 1836; MarshaU, 1895; Sterki, 

 1907a; Walker, 1898). It is also found in the western end of Lake Erie (Walker, 

 1913, p. 21). It has been reported from western New York, but the only known 



