276 



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



(nobis), but its peculiarly varied exterior will at once distinguish itj 

 from either. I know of no other American species so marked.— J 

 Anthony. 



I am pretty well satisfied that this is only a local variety] 

 of semicarinata, the thickcnecl, deeper colored, lougitudinalj 

 lines indicate periods of arrested growth. 



177. G. laevigata, Lea. 



Melania Icevis, Lea, Pliilos. Proc, ii, p. 237, Dec, 1842. Philos. Trans., viii, p. 248^ 



Obs., ii, p. 8G. 

 Melania laevigata, Lea, Proc. Pliilos. Soc, ii, p. 237. Philos. Trans., vii, p. 1G5, t. 5J 



f. 3. Obs., iii, p. 3. Whe.\tley, Cat. Shells U. S., p. 23. Cateow, Concli| 



Nomenc, p. 187. Reeve, Monog. Melania, sp. 459. 

 JPotadoma hevigafa, Lea, H. and A. Adams, Genera, i, p. 299. 

 Melania Leaii, Bkot, List, p. 34. 



iTescription. — Shell smooth, obtusely conical, rather thin, shiningj 

 yellowish ; spire rather short, carinate towards the apex ; sutures 

 Fig. 532. linear; whorls seven, i-ather convex; aperture rather largej 

 elliptical, angular at base, whitish. 



Habitat. — Alabama River at Claiborne; Judge Tait. 



Diameter, -25 ; length, -55 of an inch. 



Observations. — With the M. Taitiana herein described, came 

 two specimens of this species, which differ from the Taitiana in the 

 elevation of the spire, and the form and size of the aperture. Ii 

 the most perfect specimen the columella and base are purplish. The 

 aperture is more than one- third the length of the shell. The uppei 

 Avhorls are slightly carinate on their lower portions. — Lea. 



Originall}'' described as Imvis, which was preoccupied. DrJ 

 Brot proposed the name Leaii for this species, because IcevigaU 

 is preoccupied in Melania, but in Goniobasis that name hag 

 not been previously used, and consequently stands good. 



The figure is a copy of that given by Mr. Lea. I doubt 

 whether this is more than an immature shell of duhiosa, LeaJ 



178. G. Ohioensis, Lea. 



Goniobanis Ohioensis. Lea, Proc. Acad. Nat. Sei., p. 2G5, 1852. Jour. Acad. NatJ| 

 Sci., V, pt. 3, p. 30G, t. 37, f. 144. Obs., ix, p. 128. 



Description. — Shell smooth, conical, somewhat thin, without bauds; 

 spire obtusely conical, sharp pointed, cariuate at the apex; sutures 



