178 LAND AND FRESH-WATER SHELLS OF N. A. [pART IV. 



I dedicate this species with great pleasure to Mr. B. Pybas, of Tus- 

 cumbia, who has sent me many new mollusca from his vicinity. — Lea. 



45. G. versipellis, Anthony. 



Melanin versipellis, Anthony, Proc. Acad. Nat. Sci., p. 60, February, 1860. Bin- 

 key, Check List, No. 286. Brot, List, p. 59. Rekve, Monog. Melania, sp. 436, 



Description. — Shell small, ovate, folded, rather thin; spire not ele- 

 vated, but acute composed of about seven flat whorls ; -whorls of the 



spire all more or less folded, penult and bodj'-whorl smooth; 

 Fig. 345. 



body-whorl bulbous, subangulated, concentrically striate; 



color olivaceous, ornamented with dai'k brown bauds, of 

 which four are on the body-whorl, and one only on the spiral 

 ones, located upon or near the shoulder of each volution ; 

 aperture elliptical, about half the length of the shell, banded 

 within. 

 Habitat. — Tennessee. 



Observations. — A small and somewhat variable species as to color- 

 ation, though very constant in other characters ; it is sometimes 

 very dark both as to bands and general color, and often very light, 

 with bands scarcely distinguishable, and many varieties between. It 

 seems not to be a very common species. — Anthony. 



Fig. 345 is from Mr. Anthony's type specimen. This shell 

 is more frequently not striate. It resembles in form a young, 

 bulbous G. laqueata, but is a rather heavj^ shell, although 

 small. 



46. G. gracilis, Lea. 



Melania gracilis, Lea, Philos. Proc, ii, p. 12, Feb., 1841. Philos. Trans., viii, p. 168, 

 t. 5, f. 11. Obs., iii, p. 6. DeKay, Moll. N. York. p. 94. Troost, Cat. Shells, 

 Tenn. Wheatlev, Cat. Shells, U. S., p. 25. Binney, Check Li.st, No. 128. 

 Cati.ow, Conch. Nomenc, p. 187. Brot, List, p. 38. 

 Potadoma gracilis. Lea, CUENC, Muuuel de Conchyl., i, f. 19GS. II. and A. ADAMS, 

 Genera, i, p. 299. 



Fig. 346. 

 Description. — Shell smooth, club-shaped, rather tliin, horn- 

 colored; spire acute; sutures impressed; wliorls eight, con- 

 vex ; aperture small,'Ovate, wliitish. 

 Habitat. — Tennessee; Dr. Troost. 

 Diameter, -32; leugth, -75 of an inch. 

 Observations. — This resembles the clarata in form, but is 

 rather more robust. It differs also in color. The aperture is rather 

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



I 



