PLEDROCERA. 115 



six, flattened above ; aperture rather small, ovately rhombic, yellowish- 

 white within ; outer lip acute, sinuous ; columella slightly thickened 

 at the base, subeffuse and somewhat recurved. 



Operculum ovate, spiral, light brown, with the polar point on the 

 inner side near to the base. Fig. 218. 



Habitat. — Big Trairie Creek, Alabama; E. R. Showalter, 

 M. D. 



Diameter, -36 ; length, -98 inch. 



Observations. — This is an acuminate species with about 

 eight, regular, graceful whorls, which are towards the apex 

 usually carinate. There are five specimens before me, all 

 without bands. One of them has on the upper whorls, a 

 disposition to take on a brownish color. This species is allied to 

 Melania (Goniobasis) Ocoenisis (nobis). It is not quite so subulate, 

 has not quite so many whorls and the aperture is not so quadrate. 

 The aperture is noi quite three-tenths the length of the shell. — Lea. 



Mr. Lea's description and figure refer to this species not 

 quite fully grown. It is curious that in his description he 

 mentions six whorls, in his observations he gives it eight, while 

 his figure exhibits ten. 



I have before me a suite of over one hundred specimens 

 from North Alabama, collected by Di'. Showalter, and pre- 

 sented to the Smithsonian Institution by Dr. Jas. Lewis. 

 About half of them are banded. I have also author's t^'pes 

 from Ilaldeman's collection and collection of the Academy of 

 Natural Sciences. Fig. 217 is one of the latter. Fig. 218 

 represents Mr. Lea's original figure. 



57 a. P. lugubre, Lea. 



Melania higuhris, LEA, Philos. Proc. iv, p. 166, August, 1815. Philos. Trans, x, p. 



58, t. 9, f. 2!). Obs. iv, p.58. BlXNEY, Check List, No. IGl. IIrot, List, p. .SI. 

 Melnnia spurca. Lea, Piiilos. Proc. iv, p. li'>C, Aug., 1815. Pliilos. Trans., x, p. 5(1) 



t. 0, f. 31. Obs. iv,)). .50. BiN-NEY, Check List, No. 248. Brot, List, p. 31. 

 Melania modesta, Lea, Am. Pliilos. Trans., x, p. 83, t. 9, f. 34, 1847. 



Description. — Shell smooth, rather acutely conical, rather tliick, 

 dark-brown; spire rather elevated ; sutures widely impressed ; whorls 

 flattened ; aperture small, rhomboidal, within bluish, angular below. 



Habitat. — Alabama. 



Diameter, -37; length, -85 of an inch. 



