128 LAND AND FRESH- WATER SHELLS OF N. A. [pART IV 



71. p. Whitei, Lea. 



Trypanostoma Whitei, Lea, Proc. Acad. Nat. Sci., p. 173, 1862. Jour. Acad. Nat. 

 Sci., V; pt. 3, p. 272, t. 3G, f, 85. Obs., ix, p. 95. 



Description. — Shell smooth, attemiately conical, somewhat thick, 

 dark horn-color; spire very much raised; sutures regularly im- 

 pressed ; whorls about nine, slightly convex ; aperture small, subrhom- 



boidal, whitish within ; outer lip acute, sinuous ; columella 

 Fig. 240. . 



thickened below and twisted. 



Habitat. — Lafayette County and Marietta, Georgia; Rev. G. 

 White : Farland's Creek, Mississippi ; Dr. Spillman : and 

 Tennessee ; J. G. Anthony. 

 Diameter, -34; length, 1-8 inches. 



Observations. — From the four habitats I have sixteen speci- 

 mens. There is very little difference between them. The 

 tips are either striate or carinate. It is nearly allied to 

 Estahrookii, herein described, but it is a smaller species, with a 

 smoother and darker epidermis, and has a smaller aperture and 

 more twist at the base of the columella. The aperture is about 

 three-tenths the length of the shell. I am indebted for many speci- 

 mens, to the Rev. George White, after whom I name the species. — 

 Lea. 



72. P. attenuatum, Lea. 



Trypanostoma attenuatum, Lea, Proc Acad Nat. Sci., j). 174, 1862. Jour. Acad. 

 Nat. Sci., V, pt. 3, p. 274, t. 36, f. 88. Obs., ix, p. 96. 



Description. — Shell smooth, subulate, rather thin, horn-color; spire 



attenuate ; sutures impressed ; whorls nine, scarcely convex. 



Fig. 241. 

 the last small, aperture small, rhomboidal, white within ; 



outer lip acute, very sinuous ; columella slightly thickened 



and twisted. 



Operculum small, ovate, dark brown, with the polar point 

 near the base. 



//a^Jtof. — Lafayette, Georgia; Rev G. White: and Ten- 

 nessee; Dr. Hartman. 



Diameter, -SS; length, 1-02 inches. 



Observations. — Only two specimens have come under my observation. 

 One is not full grown. In size and general outline this species has a 

 very strong resemblance to Melania strigosa (nobis), but it differs 

 much in the aperture and the direction of the base of the columella. 



