GONIOBASIS. 335 



supposed that the above description will characterize the spe- 

 cies in its normal state. 



249. G. purpurea, Lka. 



Melnnia purpurea, Lea, Proo. Acad. Nat. Sc.i., p. 120. 



Goniobasis purpurea, LEA, Jour. Acad. Nat. Sci., v, pt. 3, p. 225, t. 34, f. 12, March, 

 1SG3. Obs., ix, p.47. 



Description. — Shell smooth, subfusiform, obtusely conical, rather 

 thin, dark brown; spire very obtuse; sutures slightly impressed; 

 whorls five, the last large; aperture rather large, elliptical, dark 

 within ; outer lip acute ; columella dark and bent inward. 



Operculum ovate, spiral, dark brown, with polar point near the 

 inner edge, and one-fourth distance from the base. 



Eahitat.— AXsihaima.] E. R. Showalter, M.D. 



Diameter, -35; length, -81 of an inch. 



Observations. — There are two specimens before me of this very 

 dark brown shell. The larger one has three bands faiutly visible on 

 the inside. It is very possible that it may be found much pj„_ Q^2. 

 less intense in color. It is a graceful, well proportioned spe- 

 cies. On the upper portion of the whorls, immediately under 

 the suture, there is a disposition to take on a light color, like 

 a thread. The aperture is about one-half the length of the 

 shell. The nearest allied species is ehenum (nobis) = Melania 

 iosto7na, Anth., but it may at once be distinguished by the line of the 

 outer lip, which in ehenum is remarkably indented, while in purpurea 

 that line is nearly straight. Ehenum is also smaller and thicker.— Lea. 



Very nearly related to G. vara, Lea. 



250. G. quadrivittata, Lea. 



Melanin qundrivittata. Lea. Proc. Acad. Nat. Sci., ISGI, p. 119. 



GoniobasU quadrivittata, Lka, Jour. Acad. Nat. Sci., v, pt. 3, p. 22G, March, 18G3. 

 Obs., ix, p. 48. 



Description. — Shell smooth, subellipticiil, a little thick, greenish-yel- 

 low, shining; spire obtusely conical; sutures very much impressed; 

 whorls eight, somewhat convex; aperture somewhat constricted, 

 ovately rhombic, whitish and four-banded within; outer lip acute, 

 columella incurved, angular at base. 



/Jaiiia;.— Coosa River, Alabama; E. R. Showalter, M.D. 



Diameter, '38; length, -Si of an inch. 



