190 Annals of the Carnegie Museum. 



Monongahela drainage it is found in the Cheat River, Fayette County. 

 It is nowhere abundant. 



6. Lampsilis luteola (Lamarck). 



Recorded by Clapp from Allegheny County, and by Rhoads from 

 the Ohio and Beaver Rivers. It is missing in Harru's list, and has not 

 been found recently in any part of the Kiskiminetas drainage. 



This species is rather scarce in the large rivers (Ohio and Alle- 

 gheny), and absent, aside from the whole Kiskiminetas drainage, in 

 the Cheat River, but present in Dunkard Creek in Greene County. 

 In the Beaver drainage it is locally very abundant, becoming in some 

 places the prevailing species. Here it goes up to Crawford County. 

 It is also frequent in some of the tributaries of the middle and upper 

 Allegheny : Crooked Creek in Armstrong County ; Little Mahoning 

 Creek in Indiana County ; French Creek in Venango and Crawford 

 Counties ; and Connewango Creek in Warren County. It is abundant 

 (the prevailing species) in Conneaut Lake and in Leboeuf Creek, just 

 below the lake. 



7. Lampsilis ligamentina (Lamarck). 



It is recorded in Harn's list from western Pennsylvania, in Stupa- 

 koff's list from Allegheny County, and in Rhoads' list from the Ohio 

 and Beaver Rivers. 



This is a common species in the larger rivers, but does not go up 

 into the smaller tributaries. It occurs everywhere in the Ohio and 

 Allegheny as far up as Warren County, but is absent in the headwaters 

 of the Allegheny in McKean County. In French Creek it goes at 

 least as far as Meadville in Crawford County. In the Beaver drain- 

 age it does not go beyond Lawrence County (in Mahoning and She- 

 nango Rivers). In the Monongahela it goes up to the Cheat in 

 Fayette County. Wherever found, it is the prevailing species, and 

 outnumbers all other species combined (with the exception of the 

 Cheat River). Conditions in the Kiskiminetas drainage are unknown. 

 It used to be there, but at present it is not any longer found there 

 alive. 



8. Lampsilis orbiculata (Hildreth). 



Reported only by Clapp from Allegheny County. 



It is found at present in the Ohio in Beaver County, and in the 

 Allegheny River in Armstrong County. It used to be in the Monon- 

 gahela at Charleroi, Washington County (Ehrmann Collection). 



9. Lampsilis recta (Lamarck). 



