Ortmann : Unionid^ of Western Pennsylvania. 189 



4. Lampsilus ventricosa (Barnes). 



In Pennsylvania according to Call (Bull. Des Moines Acad., 1885). 

 In Harn's list this species is given from western Pennsylvania as 

 U. occidens and subovaius. In Stupakoff's list it is cited from Alle- 

 gheny County as U. cariosiis. It is comprised in Rhoads' U. ovatiis 

 from the Ohio and Beaver Rivers. 



The species is very generally distributed in the larger rivers as well as 

 in the smaller creeks. It goes up in the Monongahela drainage to 

 Dunkard Creek in Greene County and the Cheat River in Fayette 

 County. In the Shenango it goes to Mercer County. It is in French 

 Creek, and in the upper Allegheny in McKean County. It is found 

 in Little Mahoning Creek in Indiana County, and in the Kiskiminetas 

 drainage in the upper Loyalhanna River in Westmoreland County, and 

 in Quemahoning Creek in Somerset County. It is locally rather 

 abundant, sometimes the prevailing species, and attains large size, as 

 for instance, in Little Beaver Creek in Beaver County, in the Slippery- 

 rock Creek in Lawrence County, and in the upper Shenango in Mer- 

 cer County. 

 4a. Lampsilis ventricosa ovata (Say). 



This species is reported by Clapp from Allegheny County. A speci- 

 men donated by Clapp is in the Carnegie Museum. It is also reported 

 by Rhoads, but only specimens from Coraopolis and Beaver belong here. 

 Call (1885) cites from '' Allegheny River to Central New York." 



The species is rather abundant in the Ohio in Beaver County, and 

 formerly was abundant in Allegheny County. It occurs in the Alle- 

 gheny River all the way up to Warren County, and also in French 

 Creek in Venango and Crawford Counties. It is entirely absent in all 

 other parts, distinctly so in the Beaver and Monogahela drainages. 

 Wherever found, it is associated with the typical L. ventricosa and 

 runs into it. Thus it should be regarded as a variety of the latter. 



5. Lampsilis multiradiata (Lea). 



Reported by Harn from western Pennsylvania, by Rhoads from the 

 Beaver River at Wampum; not in Stupakoff's and Clapp's lists for 

 Allegheny County. 



It occurs rarely in the larger rivers (Ohio in Beaver County, Alle- 

 gheny in Armstrong County); more frequently farther up, for instance 

 all over the Beaver drainage in Lawrence and Mercer Counties. It is 

 in the upper Allegheny as far as Warren County, in French Creek and 

 Connewango Creek ; in the upper Loyalhanna in Westmoreland 

 County, and the Quemahoning Creek in Somerset County, and in the 



