12 THE NAUTILUS. 



is not a single living mussel in this river from Pittsburgh to the West 

 Virginia state line (which is within a mile and a half to the south of 

 our locality). Only a few of the tributaries contain mussels, and the 

 most important one is the Cheat River, in which (in Pennsylvania), 

 a rich fauna is yet present within two miles of our locality. The 

 writer has collected repeatedly in the Cheat, in Fayette Co., from a 

 point about a mile above Point Marion up to Cheat Haven, close to 

 the State line. Another locality for Unionidce is about three miles 

 to the north, in Dunkard Creek, Greene Co., where the writer also 

 collected a number of species. It is interesting to compare these 

 faunas with that of the Indian garbage heap at Point Marion Ferry, 

 which either comes from the Monongahela proper, or from the Cheat. 

 I give first here a list of the latter. 



1. Truncilla perplexa cincinnafiensis (Lea). 3 double, 11 isolated 

 valves, all males of medium and small size. This is not the typical 

 ctncinnatiensis, but a form intermediate between this and the typical 

 perplexa (Lea); the nodes upon the disc are rather small and more 



numerous than in the typical perplexa, but they are less numerous 

 than in cincinnatiensis. 



Tuberculate forms of Truncilla perplexa have never been found 

 recently in western Pennsylvania; all specimens of perplexa of this 

 region belong to the next variety. 



2. Truncilla perplexa rangiana (Lea). 6 double, 7 isolated 

 valves, all males of medium and small size. 



Not found at present in the Monongahela drainage, but rather 

 abundant in the Allegheny River from Armstrong County upward. 

 Also in the Shenango River in Lawrence County; the nearest locali- 

 ties at present are about 80 to 100 miles away from Point Marion. 



3. Lampsilis ventricosa (Bar.). Fragment of one left valve; 

 young specimen. 



At present near Point Marion, both in the Cheat River and 

 Dunkard Creek. Widely distributed in western Pennsylvania. 



4. Lampsilis ventricosa ovata (Say). Fragment of one left valve 

 (beak portion); young specimen. 



Not found at present in the Monongahela drainage. It used to be 

 in the Ohio in Allegheny County, and is yet found in the Ohio in 

 Beaver County and in the Allegheny in Armstrong County and 

 farther up. 



5. Lampsilis multiradiata (Lea). 2 double, 1 single valve; me- 



