422 PROCEEDINGS OP THE ACADEMY OF ' [May, 



to varietal rank, is characterized by closely coiled whorls and 

 usually rather high spire, in this respect showing some approach to 

 P. fraudulenta. But the aperture is usually quite typical in the 

 position and shape of the lip teeth. Occasional specimens exhibit 

 a slight tendency to " dishing" of the upper portion of the lip, 

 but in such instances the deepest concavity of the lip is bet\^een 

 the labial teeth rather than opposite the UDper tooth, as in fraudu- 

 lenta, nor is there any rounding out of the upper lip so character- 

 istic of that species. The shell is usually of a deep i-eddish horn 

 color, with a rose-tinted lip, and closely and rather heavily striate. 

 Wetherby (Journ. Gin. Soc. K H., 1894, p. 211) has called at- 

 tention to this form as peculiar to the Roan region, and the material 

 b«^fore us shows that it extends through this whole region with but 

 slight variation except in size. The "buttressed" lower tooth 

 developed in the Smoky mountains'* seems peculiar to that region, 

 as no tendency in that direction appears in any of the shells col- 

 lected in the French Broad drainage. Three of five specimens 

 from Bluff mountain have an unusually heavy wide flat white lip, 

 which sensibly diminishes the aperture. In addition to the locali- 

 ties already mentioned, Ferriss reports it from Tyson's Cove, 

 Meadow Cove, Ivy river. Toe river and Bee Tree creek. 



Polygyra tridentata tennesseensis n. v. 



At the foot of the high bluffs which line the south side of the 

 French Broad river below Paint Rock, just over the line in Ten- 

 nessee, there occurred a very distinct form of P. tridentata, char- 

 acterized by its large size, depressed complanata-Y\k.Q form, but 

 closely and regularly striated. The lip is that of the typical 

 tridentata, with rather small marginal teeth. Of twenty specimens 

 the smallest was 19 and the largest 24 mm. in diam., the average 

 being 22|-. Only two were less than 21. This form is probably 

 the same as that mentioned by Wetherby" from Braden mountain, 

 Campbell county, Tenn., and is the same described by Clapp" from 

 Oakdale, Morgan county, and Concord, Knox county, Tenn. It 

 is also the same form found at Elizabethton, Tenn., and errone- 

 ously by one of us referred to var. complanata.^^ The Elizabethton 



9 Vide these Proc, 1900, p. 117. 

 ^'^ Journ. Cincinnati Soc. JS. H., 1904, p. 212. 

 1' These Proceedings for 1900, p. 117. 

 ^"^ Nautilus, XII, 120. 



