16 AMERICAN JOURNAL 



11a. G. viridostriatus, Lea. Fig. 20. Fusiform, rather 

 thin ; spire obtusely conical, suture irregularly impressed ; 

 whorls 5, somewhat flattened, the last convex, slightly plicate, 

 and covered throughout with raised granulate revolving stria?; 

 aperture rather small, sub-rhomboidal, columella inflected and 

 contorted. Yellowish-olive, the stria? dark green, and visible 

 within the aperture. Flint River, Geo. 



The ornamentation of this species is very peculiar, and reminds one of 

 exotic species. 



12. G. Etowah ensis, Lea. Fig. 21. Turrited, thin, pli- 

 cate, tuberculate ; spire elevated, suture irregularly much im- 

 pressed ; whorls 7, all carinate, with compressed tubercles on 

 the periphery, striate below ; aperture small, rhomboidal. 

 BroAvnish. Lake Monroe, Fla. Etowah and Tennessee Rivers, 

 Geo. 



13. G. Hallenbeckii, Lea. Fig. 22. Turrited, thin, ir- 

 regularly plicate, tuberculate; spire subulate, suture much 

 impressed ; whorls 8, somewhat convex, carinate in the middle, 

 with compressed tubercles where the plications terminate on 

 the carina, below with several revolving stride. Pale horn-color 

 or olivaceous, sometimes banded. Geo. 



Larger, more tuberculate, and with more elevated spire than the next. 



14. G. Boykiniana, Lea. Figs. 23, 24, 25, 26. Elevated, 



somewhat turrited ; spire conical, suture well impressed ; 

 whorls 7 — 8, sloping, flattened, strongly angled in the middle, 

 angle visible on the spire, somewhat tuberculate, with longi- 

 tudinal plica? above, and revolving lines below. Brownish or 

 olivaceous, sometimes banded. Geo. 



A variable species, but always distinguished from the last, among other 

 differences, by its flattened whorls. 



15. G. Bentoniensis, Lea. Fig. 27. Conical, elevated ; 

 spire raised, suture very much impressed ; whorls 7, slightly 

 convex, carinate, folded above, striate below the carina ; aper- 

 ture rather small, ovate, narrow below. Greenish horn-color, 

 not banded. Benton Co., (?) N. Ala. 



Closely allied to, if not identical with No. 14. 



16. G. papillosa, Anth. Figs. 28 — 30. Sub-turrited, thin; 

 spire conical, suture irregularly impressed ; whorls 7, sub- 

 carinate, decussated into tuberculations, coloring the surface 

 above the periphery, with several stria? below. Pale brown, 

 not banded. Etowah River, Geo. Fla. 



Figs. 28, 29 represent papillosa, the latter being from the type ; Fig. 30 is 

 Downieuna, Lea. 



17. G. Couperii, Lea. Fig.31. Turrited, thin; spire elevated, 

 suture much impressed; whorls 7, narrow, sub-carinate, with 

 raised revolving stria? all over, plicate above the periphery, 

 and slightly tuberculate at the termination of the plications. 

 Dark brown, with a broad band at base. Etowah River, Geo. 



