GONIOBASIS. 297 



Observations. — Bears no very strong resemblance to any known 

 species ; but is perhaps more nearly allied to 31. rufa, Lea, and M. 

 teres, Lea, in its elevated spire and convex whorls. It wants, how- 

 ever, the smooth whorls of the former, its dark red color, and ellip- 

 tical aperture. From the latter it may be distinguished by its striated 

 whorls, its less slender proportions, the absence of folds, its obscure 

 bands, and white aperture. This species is unusually interesting 

 from the fact that it is the first species in conchology known to have 

 been procured from the subterranean river flowing through Mammoth 

 Cave. — Anthony. 



196. G. porrecta, Lea. 



Goniobasis porrecta, Lea, Proc. Acad. Nat. Sci., p. 155, May, 1863. 



Description. — Shell striate, attenuate, blackish-brown, one-banded ; 

 spire attenuated, acuminate ; sutures slightly impressed ; whorls nine, 

 flattened ; apei'ture small, ovate, white or blackish within ; lip pj™ 573^ 

 acute, scarcely sinuous ; columella inflected and contorted. 



Habitat. — Gap Creek and Spring, Cumberland Gap, East 

 Tennessee; Captain S. S. Lyon, U. S. Army. — Lea. 



A very distinct, and apparent!}^ abundant species, 

 at its locality. I possess a number of specimens, 

 most of wliich are not banded. They are generally coA^ered 

 with raised striae, and the sutures ahnost canaliculate. 



197. G. sculptilis, Lea. 



Melanin sculptilis, LEA, Philos. Trans., x, p. 297, t. 30, f. 3. Obs., v, p. 53, t. 30, f, 3. 

 BiNSEV, Check List, No. 238. Bkot, List, p. 38. 



Description. — Shell thickly striate, conical, rather thin, horn-color; 



spire pointed, towards the apex carinate and granulate ; sutures irreg- 



„. „, ularly impressed; whorls ten, rather flattened; striai close, and 

 Fig.574. ./ I- ; J > 



4 between them sculptured ; aperture small, elliptical, angular at 

 base, white within; columella incurved and twisted. 

 Habitat. — Tennessee. 

 Diameter, -24; length, -55 of an inch. 

 Observations. — Two specimens are before me, which are precisely 

 alike. It is a very remarkable species, having regular and close strise 

 over the whole of the lower whorls, between which stria? there is a 

 double row of miuute, indented marks, very close to each other, and 



