304 ORTMANN— THE ALLEGHENIAN DIVIDE. [April 18, 



W. Va., immediately below the canyon, the others are from Cheat 

 Haven in Pennsylvania, about eight miles farther below. 



List No. ii. 



i. Fusconaia subrotunda (Lea) 



2. Crenodonta plicata undulata (Barn.) 



3. Quadrula pustulosa (Lea) 



4. Rotundaria tuberculata (Raf.) 



5. Pleurobema clava (Lam.) 

 *6. Elliptio dilatatus (Raf.) 

 *7. Symphynota costata (Raf.) 

 *8. Alasmidonta marginata (Say) 

 *g. Strophitus edentulus (Say) 



*io. Ptychobranchus phase olus (Hildr.) 



11. Nephronaias ligamentina (Lam.) 



12. Eurynia iris (Lea) 

 *I3. Eurynia recta (Lam.) 



*I4. Lampsilis ovata ventricosa (Barn.) 

 *I5. Lampsilis multiradiata (Lea) 



The eight species found near Mont Chateau are not in the main 

 channel of the river, but in small side branches, which are more or 

 less protected. In the main channel the bottom consists of large 

 boulders and rocks, not firmly packed, but loose and easily movable, 

 chiefly at flood stage. Moving and shifting bottom prevents perma- 

 nent settlement of Najades. At Cheat Haven conditions are more 

 favorable, and here we have a rich fauna, agreeing well with that 

 of the lower Monongahela, but of course somewhat depauperated 

 corresponding to the smaller size of the river. 



Tygart Valley River, which joins West Fork River at Fairmont, 

 to form the Monongahela, has the same character as the Cheat. 

 There is a more slowly running upper part, above Elkins, Randolph 

 Co., W. Va., a rather long canyon, down to Grafton, and a less 

 rough portion below this. In the canyon a tributary flows into it, 

 Buckhannon River, which again is running more slowly in its upper 

 part. 



