I9I3.] ORTMANN— THE ALLEGHENIAN DIVIDE. 299 



5. Obovaria circulus lens (Lea) 



6. Lampsilis luteola (Lam.) 



This part of the creek is a very small stream. Of the six species 

 found here, three are also in the uppermost Allegheny and in Little 

 Mahoning, while three (nos. i, 3, 5) are absent in them. Anodonta 

 grandis is a small-creek-form elsewhere, but Fusconaia undata ru- 

 biginosa and Obovaria circulus lens are peculiar to this creek, and 

 although they are also small-creek-forms, they are not known to 

 advance so far up toward the divide in other rivers. Of course, we 

 should bear in mind that other tributaries of the Allegheny in this 

 section, the fauna of which has been destroyed, might have con- 

 tained these species. 



The full and typical Kiskiminetas-C onemaugh fauna is irrepa- 

 rably lost to us on account of pollution of the waters. However, a 

 few remnants have been preserved. Nothing is known from the 

 Kiskiminetas proper. In the Conemaugh River at New Florence, 

 Westmoreland Co., I found the dead shells of the following forms : 



1. Pleurobema obliquiim coccineum (Conr.) 



2. Pleurobema clava (Lam.) 



3. Elliptio dilatatus (Raf.) 



4. Ptychobranchus phaseolus (Hildr.) 



5. Nephronaias ligamentina (Lam.) 



6. Eurynia recta (Lam.) 



7. Lampsilis ovataventricosa (Barn.) 



8. Lampsilis multiradiata (Lea) 



These are all found in the Allegheny above Oil City, but it is 

 hardly probable that this list contains more than half of the species 

 originally present in the Conemaugh. 



From small tributaries in Westmoreland and Indiana Cos., I was 

 able to secure four species : 



Elliptio dilatatus (Raf.) — ^Yellow Creek, Indiana Co. 

 Symphynota costata (Raf.) — Two Lick Creek, Indiana Co. 

 Anodonta grandis Say — Beaver Run, Westmoreland Co. 

 Strophitus edentulus (Say) — Yellow Creek and Blacklegs 

 Creek, Indiana Co., and Beaver Run, Westmoreland Co. 



