OF CONCHOLOGY. 19 



28c. G. Smithsoniana, Lea. Fig. 58. Fusiform, some- 

 what thick, mucronate ; spire obtusely conical, plicate, suture 

 impressed; whorls 7, planulate, angulate above the suture, the 

 last large and somewhat obscurely angulate ; aperture rather 

 large, sub-rhomboidal, a little effused at base. Dark horn- 

 color, whitish within. N. Geo. E. Term. 



28d. G. Emeryensis, Lea. Fig. 59. Sub-fusiform, rather 

 thin ; spire obtusely conoidal, suture irregularly impressed ; 

 whorls 6, planulate, above distantly plicate, body whorl smooth, 

 obsoletely angulate in the middle ; aperture rather large, sub- 

 rhomboidal. Dark olive, without bands, bluish-white within. 

 Rocky Greek, branch of Emery Run, E. Term. 



29. G. Lecontiana, Lea. Fig. 60. Conical, thick ; spire 

 obtusely elevated, suture slight ; whorls 6, flattened, with 

 somewhat curved folds ; aperture large, elliptical. Horn- 

 color, bluish within. Geo. 



31. G. obtusa, Lea. Figs. 61, 62. Sub-fusiform, some- 

 what thick, inflated ; spire very obtuse, suture irregularly im- 

 pressed; whorls 5, slightly convex, cancellate above; aper- 

 ture very large, ovately rhomboidal. Yellowish horn-color, 

 white within. Tenn. Geo. 



Fig. 62 represents G. cadus, Lea. 



32. G. amcena, Lea. Fig. 63. Sub-fusiform, thick ; spire 

 obtusely conical, suture irregularly impressed; whorls 6, 

 somewhat convex, folded, striate at the apex ; aperture large, 

 ovately rhomboidal. Pale chestnut-color, without bands, 

 whitish within. N. Ala. 



33. G. Tuomeyi, Lea. Fig. 64. Fusiform, rather thick ; 

 spire obtusely conical, the first few whorls closely plicate, su- 

 ture impressed ; whorls 6, flattened above, the last ventricose, 

 smooth; aperture large, rhomboidal, columella twisted. Yel- 

 lowish-olive, with or without bands. N. Ala. 



35. G. interveniens, Lea. Fig. 65. Conical, rather thin 

 spire obtusely conical, suture irregularly and very much im- 

 pressed ; whorls 6, flattened, with distant large curved folds, 

 becoming obsolete towards the middle of the body whorl. 

 Dark horn-color or brown, double-banded or without bands; 

 white, brown, or banded within. N. Ala. 



36. G. olivella, Lea. Fig. QQ. Fusiform, rather thick; 

 spire obtusely conical, suture irregularly very much impressed ; 

 whorls 5, somewhat convex, shining, folded ;■ folds decussated 

 just below the suture. Olivaceous, without bands, white 

 within. Tenn. 



