1902.] NATURAL SCIENCES OF PHILADELPHIA. 423 



examples are ligliter iu color than the Paiut Rock specimens and 

 rather smaller, being from Id^ to 21 J mm. iu diameter, in this 

 respect resembling the Moi'gan county shells, described by Clapp. 

 Polygyra fraudulenta Pilsbry. 



jNIeadow Cove, a single typical example, diameter 15 mm. 



Polygyra rugeli (Shuttl.). 



Of general occurrence, but not so abundant as in the Great 

 Smoky mountains. At Paint Rock, south side, where it occurred 

 with P. tridentata tennesseensis, the specimens were uniformly 

 large, 13|^ to 14J mm. in diameter. Another lot from the same 

 side, collected later by one of the guides, but probably further 

 dowTi the river, were smaller, 11 to 12;^ mm. Similar specimens 

 were found at Paint Rock creek, on the north side of the river. 

 This seems to be the prevailing size throughout the French 

 Broad region, and only occasional specimens from Bluff mountain, 

 Tyson's Cove and Wilson's Cove exceeded 13 mm. in diameter. 

 Ferriss found a few specimens also at Meadow Cove, Ivy river. 

 Toe river and Bee Tree creek. 



Polygyra inflecta (Say). 



At Paint Rock, on the south side of the river, all the specimens 

 were small, 9 to 9 J mm. in diameter, with the whole shell more or 

 less tinged with pink and frequently the lip as well. 



In the coves aroimd Mitchell, Cat-tail, Tyson's and Wilson's, 

 all the specimens were albinos and quite large, 13^ to 14 mm. in 

 diameter. Not a single normally colored individual was found in 

 any of these localities. While occasional albino examples are not 

 uncommon in nearly all the American Helicidse, this occurrence of 

 a race wholly albino inhabiting a large extent of territory is quite 

 w^ithout precedent. Why this one species should be affected in this 

 way is difficult to imderstand. Koue of the other species in the 

 district exhibited any tendency to albinism to any greater extent 

 than is likely to occur anywhere. It forms one of the striking 

 peculiarities of the Mitchell fauna, and is analogous to the occur- 

 rence of Polxjfjyra suhpalliata at Roan, which is always of the same 

 pale -green color. 



Polygyra profunda (Say). 



Paint Rock, south side, two specimens only; evidently scarce. 



