202 



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



Fig. 395. 



convex; aperture rather small, subrhomboidal, whitish within ; outer 

 lip acute, sinuous ; columella beut in, thickened and slightly twisted. 

 Habitat. — Grayson County, Kentucky; S. S. Lyon. 

 Diameter, -30; length, -92 of an inch. 



Observations. — A single specimen of this species was among 

 the Melanidce collected by Mr. Lyon in the geological survey 

 of Kentucky. It was accompanied by Melania (Goniobasis) 

 Deshayesiana (nobis), to which it is closely allied in some of 

 its characters. It differs in having two or three more whorls, 

 in being more cancellate above, by the striaj decussating the 

 ^ longitudinal ribs, and particularly in the lowcrv part of the 

 columella being nearly straight, while that part in Deshayes- 

 iana is oblique to the right. The ribs are pretty close and slightly 

 curved, the inner margin of the outer lip is slightly thickened. The 

 aperture is rather less than one-third the length of the shell. I dedi- 

 cate this with great pleasure to Mr. Lyon, civil engineer and state 

 geologist. — Lea. 



82. G. curvicostata, Anthony. 



Melania ctirvicostata, Anthony, MSS. Reeve, Monog. Melania, sp. iCfl 



List, 1). 35. 

 Melania densecostata, REEVe, Monog. Melania, sp. 4G5. Bhot, List, p. 35. 



Brot, 



Description. — Shell ovatcly turreted, livid olive, encircled towards 

 the apex with a reddish line, whorls convex, longitu- 

 dinally, plicately ribbed, ribs curved, gradually fading 

 towards the aperture; aperture ovate, slightly effused at 

 the base, interior tinged with purple. 



Habitat. — Florida, United States. — Reeve, 



Fig. 397. 



The following appears to me to be the 

 same species. 



31elania densicostata. — Shell subulately turreted, burnt 

 olive, whorls eight to nine, rather flat, longitudinally, 

 densely plicately ribbed, the last obtusely angled ; aper- 

 ture rather small, ovate, interior very faintly tinged 

 with purple. 

 Habitat. — Florida, United States. 



This interesting little species is of the same type as M. curvicostata, 

 just described, but the ribs are stout and comparatively straight, 

 ending abruptly on an obtuse angle of the last whorl. — Reeve. 



