32 AMERICAN JOURNAL 



146. G. auricoma, Lea. Fig. 198. Fusiform, smooth, 

 thin ; spire very obtuse, suture linear ; whorls 5, slightly con- 

 vex ; aperture very large, sub-rhomboidal. Yellowish, often 

 with narrow bands. Tennessee River. 



147. G. glabra, Lea. Conical, smooth, rather thin, 

 shining ; spire somewhat elevated, suture impressed ; whorls 

 6, flatly convex, the first ones sub-carinate ; aperture elonga- 

 ted, columella incurved. Dark chestnut, purple within. Hol- 

 ston River, E. Tenn. 



148. G. graminea, ILald. Fig. 199. Conical, short, in- 

 flated, smooth, polished; spire obtuse, suture moderate; whorls 

 5, somewhat convex; aperture large, rhomboidal, somewhat 

 angular below. Brilliant green, with a light yellow sutural 

 band, bluish within. 



149. G. gibbosa, Lea. Fig. 200. Obtusely conical, gib- 

 bous, rather thin ; spire obtuse, suture irregularly impressed ; 

 whorls 5, somewhat convex, the last large ; aperture large, 

 elliptical, columella thickened, flattened, impressed, and much 

 curved. Greenish horn-color, banded above and below in the 

 interior, columella red. Sciota River, Ohio. 



Differs from all the other species in the very flat, impressed columella. 



151. G. COgnata, Anth. Fig. 201. Ovate, short, smooth, 

 moderately thick ; spire very small, obtuse, suture deeply im- 

 pressed ; whorls 6, convex, the last one very large ; aperture 

 moderate, broad ovate, columella deeply rounded, indented 

 and caUous. Brownish-yellow, with three sub-central brown 

 bands, and one obscure sutural one, bands visible within the 

 aperture. Tenn. 



152. G. Georgiana, Lea. Fig. 202. Fusiform, inflated, 

 smooth, rather thick ; spire obtusely elevated, suture very 

 much impressed ; whorls 5, very convex, the last large ; aper- 

 ture large, sub-rhomboidal, columella bent in, thickened and 

 somewhat twisted. Bright yellowish, with dispersed whitish 

 maculations and three bands. N. Oeo. 



153. G. abrupta, Ljea. Fig. 203. Short conical, smooth, 

 rather thick ; spire short conical, suture linear ; whorls 7, flat- 

 tened, the last large, sub-angulate on the periphery ; aperture 

 large, rhomboidal, columella curved and much thickened be- 

 low. Yellowish, generally with two approximate sub-central 

 bands. Ala. 



154. G. depygis, Say. Fig. 204. Oblong, conic ovate, 

 moderately thick ; spire conic, suture well impressed; whorls 

 5, the last somewhat elliptical ; aperture narrow ovate, acute 

 above. Yellowish, generally with two rufous bands, equidis- 

 tant from the suture, the base, and each other. Ohio River. 



