GONIOBASIS. 195 



72. G. costulata, Lea. 



Melania costulata, Lea, Philos. Proc, ii, p. 14, Feb., 1841. Philos. Trans., viii, p. 



181, t. 6, f. 39. Obs., iii, p. 19. Binnet, Check List, No. 73. DeKay, Moll. 



N. Y., p. 98. Jay, Cat. 4th edit., p. 273. Troost, Cat. Shells, Tennessee. 



WHE.4.TLEY, Cat. Shells, U. S., p. 24. Reeve, Monog. Melania, sp. 272, 360. 



BuoT, List, p. 3.5. 

 Melasma costulata, Lea, Adams, Genera, i, p. 300. 



Description. — Shell folded, conical, rather thin, yellow, above cari- 



nate ; spire rather elongated; sutui'cs impressed; whorls 



Figi 383. 

 nine, rather convex ; aperture small, subovate, within bluish. 



Habitat. — Barren River, Kentucky: Tennessee. 



Diameter, -CO ; length, -82 of an inch. 



Observations. — In its general characters this species re- 

 sembles M. laqueata, Say. It may be distinguished in its 

 being of less diameter and being more slender. The speci- 

 mens received from both Dr. Troost and Dr. Currey were covered 

 with a deposit from the oxide of iron, giving them a black hue. 

 Under this the epidermis is yellow. The aperture is about one-third 

 the length of the shell. — Lea. 



73. G. cinerella, Lea. 



Goniohasis cinerella. Lea, Proc. Acad. Nat. Sci., p. 269, 1862. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 328, t. 38 f. 184, March, 1863. Obs., ix, p. 150. 



Description. — Shell folded, subfusiform, thin, pale, ash-color, with- 

 out bands ; spire obtusely conical ; sutui'es irregularly impressed ; 



whorls six, slightly convex ; aperture somewhat large, ovately 

 Fig. 384. ' =. J s ■> J 



rhomboidal, whitish within ; outer Up acute, scarcely sinuous; 



4 columella bent in and slightly twisted. 

 Habitat. — Tennessee; Coleman Sellers. 

 Diameter, -23 ; length, -49 of an inch. 

 Observations. — A single specimen only was received from Mr. 

 Sellers. It came with two young Melania {Goniobasis) rugosa 

 (nobis), which it resembles, but this little species is not clathrate 

 over the whole of the upper whorls, having only two transverse 

 stria?, which cut tlie folds below the suture, forming granules. The 

 folds are close and tliick, and nearly straight. The aperture is nearly 

 half the length of the shell. — Lea. 



