OF CONCIIOLOGY. 53 



155. G. liveseens, Mhe. Figs. 205 — 207. Ovate oblong, 

 smooth, moderately thick; spire short, conieally acute, suture 

 slightly impressed; whorls 5 — 6, rather flat, the last large; 

 aperture large, elliptical. Horn-color, purple within. All the 

 Great Lakes and streams emptying into them. 



Fig. 206 is G. napella, Anth., and Fig. 207 is G. cu$pidata, Anth. 



156. G. Milesii, Lea. Fig. 208. Sub-fusiform, smooth, 

 rather thick; spire sub-elevated, suture irregularly impressed ; 

 whorls 6, sub-inflated; aperture large, columella slightly in- 

 curved. Olivaceous, purplish within. Tuscola Co., Mich 



Closely allied to UveseenB, but appears to be more convex, and to attain a 

 larger size. I am not satisfied that it is a distinct species. 



157. G. simplex, Say. Figs. 209 — 212. Convex, sub- 

 fusiform, smooth, rather thick, rapidly enlarging; spire atten- 

 uated, sub-enrinate, apex acute, suture not deeply impressed ; 

 whorls 8, the last large, convex; aperture moderate oval. 

 Dark brown, dull red within. ILolston and Clinch Rivers, S. 

 W. Ya.. and E. Tenn. 



Fig. 209 represents the type ; Fig. 210 is Wurderiana, Lea, in which the 

 apicial whorls arc persistent and perfect; Fig. 211 is subsolidu, Lea, and 

 Fig. 212 is VanuxemU, Lea, 



158. G. Potosiensis, Lea. Convexly conical, carinate, 

 rather thin; spire obtusely elevated, suture much impressed ; 

 whorls 8, convex. Brown, purplish within. Potosi, Mo. 



Very closely allied to G. simplex. It is one of the very few species 

 found west of the Mississippi River. 



159. G. torta, Lea. Fig. 213. Club-shaped, smooth, ra- 

 ther thick ; spire obtusely elevated, suture impressed ; whorls 

 7, slopingly convex, the last large; aperture very large, ellip- 

 tical, columella twisted. Dark brown, bluish- white within. 

 Big Creek, Lawrence Co., Tenn. 



"When the spire is perfect, it is attenuately drawn out, the same as in 

 some species of GyUndrella. 



160. G. Saflfordi, Lea. Fig. 214. Obtusely conical, smooth, 

 thick; spire rather short, suture linear; whorls 7 (when not 

 eroded), slightly convex, the last large, gibbously enlarged in 

 the middle; aperture large, oval, elongated, columella twisted. 

 Dark green, purple within. I^ebanon, Wilson Co., Tenn. 



160a. G. virens, Anth. Fig. 215. Ovate conic, smooth, 

 thick; spire obtusely elevated, suture well impressed; \\ horls 

 *i, convex, the last large; aperture large, elliptical, columella 

 well rounded, with a slight sinus at base. Light green, paler 

 towards the summit, bluish within. Ala. 



161. G. Newberryi, Lea. Fig. 216. Ovately conical, 

 smooth, rather thin; spire obtusely elevated, suture much im- 

 pressed; whorls 6, inflated; aperture rather small, ovately 

 rounded, outer lip inflated, columella incurved. Dark brown, 

 triple-banded, yellow below the suture, whitish and banded 

 within. Oregon. 



