GOKIOBASIS. 303 



Description. — Shell smooth, pupaaform, somewhat raised, rather 

 thick, yellowish-brown, four-banded ; spire somewhat raised ; sutures 

 very much aud irregularly impressed; whorls seven, somewhat con- 

 vex; aperture small, constricted, subelliptical, whitish within ^.^ ^^ 

 and banded ; outer lip acute ; columella white, bent in, twisted 

 and subangular at the base. 



Operculum small, ovate, thin, dark brown, with the polar KS^ 

 point near the base. 



Habitat. — Coosa River, Alabama; E. R. Showalter, M. 



Diameter, '37 ; length, -89 of an inch. 



Observations. — A species very closely allied to Melanin (Goniobasis') 

 Alabamensis (nobis), but it may be distinguished by its being smaller, 

 more constricted, and being slightly more cylindrical. The bands are 

 smaller and not quite so well expressed. When I received the first 

 specimen, I considered it a small variety of Alabamensis, but having 

 received others from Dr. Showalter, I cannot but consider it a dis- 

 tinct species inosculating on the other. The aperture is about one- 

 third the length of the shell. — Lea. 



This species is nearl}^ related to (7. fallax, Lea, and at first 

 I uiiited it with that species, but I am now convinced that it 

 is distinct. Among the points of difference may be mentioned 

 the greater convexity of its whorls, brighter color, and the 

 constant ornamentation of four distinct, dark bands, the upper 

 of which is the broadest. A single band appears on the whorls 

 of the spire. G. fallax is a more cylindrical species. 



204. G. Alabamensis, Lea. 



Melnnia Alahamensis. Lka, Proc. Acad. Kat. Sci., 18G1, p. 121.» 



fJoniohasis Alalxanensis, LEA, Jour. Acad. Nat. Sci., v, \)t. 3. p. 232, t. 31, f. 2", March, 

 18C.!. Obs., ix, p. 54. 



Description. — Shell smooth, pupaaform, subclevatcd, rather thick, 

 yellowish, four-banded ; spire raised; sutures very much impressed; 

 Fig. -)8i. whorls about seven, convex; aperture small, rather con- 

 stricted, subelliptical, whitish and banded within; outer lip 

 sharp; columella inflected, whitisli, obtusely angular at base. 

 Habitat. — Coosa Iliver, Alabama; E. R. Sliowaltcr, M.D. 

 Diameter, -38 ; length, '92 of au inch. 



Observations. — This species is allied to clausa, herein de- 

 scribed, but it is more conical and less cylindrical. One of the two 



