48 LAND AND FRESH-T7ATER SHELLS OF N. A. [pART IV. 



Description. — Shell conic, with convex whorls ; spire short ; one 



whorl entire, very convex ; apex eroded ; color olive, with two broad 



purple bands on the bodv-whorl; one on the contiguous 

 Fig. 95. - ) o 



whorl ; columella with a callus above and another near the 



base ; aperture half the length of the shell ; labrum regu 



larly arcuated; within bluish, with purple bands 



Habitat. — Black Warrior River. 



Observations. — It is a rare species, remarkable for its broad, 



purple bands and convex whorls. 



There can be no doubt of the identity of hitmniata and 

 ClarJdi. I give a good figure of the former from an authenti- 

 cated specimen in Coll. Anthony. The number of bands on 

 the body-whorl varies from two to five. Mr. Lea's description 

 of Clarkii and a copy of his figure follow : — 



Strephobasis Clarkii. — Shell smooth, cylindrical, rather thin, yel- 

 lowish horn-color, trebly banded ; spire very obtuse, short ; sutures 

 irregularly impressed; whorls five, slightly convex above, the last 

 one constricted ; aperture rather large, squarish, whitish and much 

 banded within; outer lip acute ; columella sinuous, white at the base, 

 thickened and channelled backward. 



Habitat. — Tennessee River, at Chattanooga, Tenn. ; Joseph Clark. 



Diameter,-38; length '72 inch. 



Observations. — Several specimens of this shell were long since sent 

 to me by my deceased friend, Mr. Clark, and it is with peculiar 

 pleasure that I dedicate it to him who, during a long life, 



Fi 



devoted his best energies to the investigation of the fauna 

 and flora of Ohio, and other "Western States. This species 

 differs from the other two, herein described (cornea and 

 Spillmanii), in being more regularly cylindrical; in being 

 shorter and in having three regularly revolving brown 

 bands, one of which only is observable on the upper whorls. The 

 aperture is more than one-half the length of the shell. There is a 

 thickening in the interior of the upper part of the whorls, which 

 in some specimens is irregular and oblique, and is observable from 

 the outside. It gives a yellowish appearance to this part of the whorl 

 under the suture. — Lea. 



