ORTMANN: monograph of the naiades of PENNSYLVANIA. 299 



Tennessee ventricosa has some peculiarities of its own. These shells wiU be treated 

 elsewhere. 



Localities in Pennsylvania represented in the Carnegie Museum: 



Oliio River, Industry, Beaver Co.; Coraopolis (S. N. Rhoads), Neville Island, and Edgeworth, Allegheny 

 Co. (G. H. Clapp). 



Allegheny River, Braeburn, Westmoreland Co.; Aladdin, Godfrey, Johnetta, Kelly, and Templcton, Arm- 

 strong Co.; Walnut Bend, Venango Co.; Tionesta and Hickory, Forest Co.; Warren, Warren Co. 



French Creek, Cochranton, Meadville, and Cambridge Springs, Crawford Co. 



Conneaut Outlet, Conneautlake, Crawford Co. 



Other localities represented in the Carnegie Museum: 



Ohio-drainage: 

 Ohio River, Toronto, Jefferson Co., Ohio; Wheeling, Ohio Co., West Virginia (W. F. Graham); St. 



Marys, Pleasants Co., West Virginia; Portland, Meigs Co., Ohio. 

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



Tennessee-dra in age : 

 Tennessee River, Tuscumbia, Colbert Co., and Florence, Lauderdale Co., Alabama (H. H. Smith). 

 Paint Rock River, Paint Rock and Princeton, Jackson Co., Alabama (H. H. Smith). 

 Holston River, McMillan and Mascot, Knox Co.; Hodges, Jefferson Co.; Turley Mill and Holston 



Station, Grainger Co., Tennessee. 

 Clinch River, Sol way, Knox Co.; Edgemoor, Clinton, and Offutt, Anderson Co.; Black Fox Ford, 



Union Co.; Clinch River Station, Claiborne Co.; Oakman, Grainger Co., Tennessee; Clinchport, 



Scott Co., Virginia. 

 Powell River, Combs, Claiborne Co., Tennessee. 



Distribution and Ecology in Pennsylvania (See fig. 32) : This species is abundant 

 in the Ohio below Pittsburgh, and in the Allegheny all the way up to Warren 

 Coimty. According to Call (1885) it passes by this route into New York, but 

 Marshall (1895) does not report it from the uppei-most Alleghenj' and it has not 

 been found in McKean County, Pennsj'lvania. From the Allegheny it enters 

 French Creek and extends up to Cambridge Springs. It also enters Conneaut 

 Outlet (but only one dead shell was foimd there). It is foimd in no other stream, 

 and its absence is especially noticeable from the whole Beaver-drainage, where 

 L. ovata ventricosa on the other hand is common. 



No records from the Monongahela are known. However, it is probable that 

 it once existed in the Monongahela proper, at least as far as to the West Virginia 

 state line, for I was able to identify' it among the shells from an Indian garbage 

 heap at Point IMarion (Ortmann, 1909c). It is not found in the upper ■Slonon- 

 gahela-drainage in West Virginia, where L. ovata ventricosa is locally abundant. 



Thus L. ovata is clearly a form prefering larger rivers, and, according to my 



