260 LAND AND FRESH-AYATER SHELLS OF N. A. [PART IV. 



156. G. Canbyi, Tryon. 



Goniobasis Etoicahensis, Lea,* Proc. Acad. Nat. Sci., p. 264, 1SC2. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 299, t. 37, f. 133, March, 1863. 



Description. — Shell smooth, conoidal, thin, dark, double-bauded ; 

 spire somewhat raised; sutures impressed; whorls seven, slightly 

 convex; aperture rather large, subrhomboidal, dark and broadly 

 banded within ; outer lip acute and siiiuous ; columella bent in and 

 very much twisted. 



Habitat. — Etowah River, Georgia; J. Postell, 



Diameter, -30; length, 'li of an inch. 



Observations. — A single specimen only was sent to me by Mr. 



Postell. At first sight it would be taken for Melania (Gonio- 

 Fig 500. " ^ 



basis) gracilior, Anth., having the same dark hue, made so by 



the two, broad, dark brown bands. It differs from it in being 

 less conical, in having a larger aperture which is more angu- 

 lar at the basal margin. The two broad bands cover nearly 

 two-thirds of the last whorl, leaving a yellowish interspace. 

 In this specimen there is a brown, elongate spot at the base of the 

 columella. The aperture is about three-eighths the length of the 

 shell. — Lea. 



157. G. ovoidea, Lea. 



Melania ovoidea, Lea, Philos. Proc, iv, p. 167, Aug., 1845. Philos. Trans., x, p. 61, 



t. 9. f. 38. Obs., iv, p. 61. Binney, Check List, No. 193. Bkot, List, p. 38. 

 Potadoma ovoideus, Lea, Adams, Genera, i, p. 299. 



Description. — Shell smooth, elliptical, rather thick, horn-color; 

 spire short; sutures slightly impressed ; whorls six, slightlj" convex ; 

 aperture large, nearly ovate, within white. 



Habitat. — Alexandria, Louisiana. 



Diameter, "2 ; length, -44: of an inch. 



Observations. — A single specimen only of this little species was 

 found among the shells sent by Dr. Hale. It differs entirely yj ^qj 

 from the other two species, and approaches Mr. Say's depygis, £L 

 but is smaller, and has a proportionately larger aperture, ^m^ 

 The aperture is quite one-half the length of the shell. The ^^ 

 columella is somewhat thickened on the superior portion. In the 



*G. Etoicahetisis, Lea, being preoccupied by Mr. Reeve, wlio described and figured 0. 

 Canhyi, Lea, under that name lu advance of Mr. Lea's description, we apply the latter's 

 name to this species. 



