GONIOBASIS. 311 



give the exterior a dark browuisli or subraaculate appearance. Two 

 of the specimens are entirely without bands. The aperture is about 

 one- third the leugtli of tlie sliell. — Lea. 



217. G. crepera, Lea. 



Melania crepera. Lea, Proc. Acad. Nat. Sci., 1861, p. 123. 



Goniobasis crepera, Lea, Jour. Acad. Nat. Sci., v, pt. 3, p. 240, t. 34, f. 42, March, 

 1863. Obs., ix, p. 62. 



Description. — Shell substriate, conical, somewhat thick, sooty- 

 brown ; spire somewhat raised ; sutures irregularly impressed ; whorls 

 six, somewhat convex; aperture ovately rhombic, whitish within; 

 outer lip acute ; columella inflected, slightly thickened above, Fig. 597. 

 obtusely angular at the base. 



Habitat. — Yellowleaf Creek, Shelby County, Alabama; 

 E. R. Showalter, M.D. 



Diameter, -41 ; length, -83 of an inch. 



Observations. — This species is closely allied to Ilaysiana 

 (nobis), but is less striate, has a darker epidermis, is rather smaller 

 and not so solid. Some of the specimens have but few and obscure 

 strisB on the lower part of the whorls, while others have them over 

 the whole whorl. None were perfect enough to show the character 

 of the apical whorls. The length of the aperture is more than one- 

 third the length of the shell. — Lea. 



218. G. abscida, Anthony. 



Melania abscida, Anthony, Proc. Acad. Nat. Sci., ISGO, p. 5G. Binney, Check LLst, 

 No. 4.35. Bkot, List, p. 32. Reeve, Monog. Melania, sp. 395. 



Description. — Shell ovate, smooth, olivaceous, thick ; spire obtuse, 

 composed of five low whorls, nearly flat; body-whorl large, occu- 

 pying nearly the entire length of tlie shell ; aperture not broad, but 

 long, subrhombic, more than half the length of the 

 shell; columella deeply rounded and indented; outer lip 

 much curved and produced ; sinus broad and conspicuous. 

 Habitat. — Alabama. 



Observations. — A ponderous species, whose chief char- 

 acteristic is its square form and short, truncate spire, 

 resembling in that respect M. planospira (nobis). It diflers from that 

 species, however, b}' its more elongate form, narrow, rhombic aper- 



