GONIOBASIS. 263 



Ohservations. — I have about two dozen specimens before me from 

 the different habitats. Those from East Tennessee are shorter and 

 not so well characterized, having less marked bands, some even being 

 without them. The best developed are from the Coosa River. Two 

 specimens from Fannin County, Georgia, have a bright j-ellow epider- 

 mis without bands, and may belong to a distinct species. The four 

 bauds are remarkably regular in this species. The two middle ones 

 are near to each other and the lower of the two is smaller than the 

 upper. It is allied to grata, Anth. The aperture is rather more than 

 one-third the length of the shell. — Lea. 



161. G. flava, Lea. 



Goniobasis flava, Lea, Proc. Acad. Nat. Sci., p. 2G4, 18G2. Jour. Acad. Nat. Sci., v, 

 pt. 3, p. 303, t. 37, f. 139, March, 1803. Obs., ix, p. 12a. 



Description. — Shell smooth, obtusely conical, rather thin, yellow, 

 three-banded; spire obtusely conical ; sutures very much impressed; 

 whorls about six, somewhat convex; aperture rather small, ovate, 

 white and three-banded within ; outer lip acute, slightly sin- Fig. 506. 

 uous ; columella bent in and thickened. 



Operculum ovate, dark brown, with the polar point near 

 to the edge and above the basal margin. ' *'*'** 



Habitat. — Benton County? N.E.Alabama; G. Hallenbeck. 



Diameter, -35 ; length, -88 of an inch. 



Observations. — A single specimen, only, of this pretty species, was 

 sent to me by Mr. Hallenbeck. It cannot be confounded with any 

 other species known to me. It reminds one of Melania grata, Anth., 

 but it has a rounder base, is not fusiform, and has but three bands, 

 ■which are well marked inside and out. The three bands are equi- 

 distant and of equal size. The upper part of the columella is thick- 

 ened, and in this specimen the color of the upper baud is extended 

 over part of this callus. The aperture is rather more than one-third 

 the length of the shell. — Lea. 



162. G. tenebrovittata, Lea. 



Goniobasis tenebrovittata, Lka, Proo. Aoad. Nat. Sci., p. 201, 18G2. Jour. Acad. 

 Nat. Sci., V, pt. 3, p. 301, t. 37, f. 13G, March, 18J3. Obs., ix, p. 123. 



Description. — Shell smooth, high conical, rather thin, yellowish, 

 banded or without bauds; spire somewhat rai.sed; sutures slightly 



