NEW FRESH WATER AND LAND SHELLS. 175 



spiral operculum. It belongs to a natural group in the genus Melania, which 

 have very low spires and a very large body whorl. There is a very slight 

 impression on the superior part of the whorls below the suture. The aperture 

 is about two-thirds the length of the shell. The epidermis in young speci- 

 mens is a very pale yellow, almost white. 



Melania STRiGosA. Plate 5, Fig. 24. 



Testa IcEvi, turrito-acutd, tenui, pallida -luted, superne striata ; spird exsertd; suturis impressis; an- 

 fractibus novenis, planulatis; aperturd parvd, ellipticd, ad basim angulatd, intus caruled. 



Shell smooth, acutely turrited, thin, pale yellow, striate above; spire drawn out; sutures impressed; 

 whorls nine, flattened ; aperture small, elliptical, angular at the base, within bluish. 



Hab. Tenn. Dr. Troost. 

 " Holston River. Dr. Warder, 



My Cabinet, and Cabinets of Dr. Troost, and Dr. Warder. 

 Diam. .27, Length .85 of an inch. 



Remarks.— 'This species is somewhat like the teres herein described. It may 

 be distinguished, however, at once by its flattened whorls and darker colour. 



Melania virgata, Plate 5, Fig. 25. 



Testa l<Bvi, subrotundd, subtenui, luted, bifasciatd, nitidd; spird brevi; suturis linearibus; anfractibus 

 convexis; aperturd magnd, ellipticd, albidd. 



Shell smooth, rounded, rather thin, yellow, double-handed, shining; spire short; sutures linear; whorls 

 convex; aperture large, eUiptical, whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .20, Length .30 of an inch. 



Remarks. — ^A single specimen only of this small species was sent to me by 

 Dr. Troost. It seems to be mature, and is remarkable for the two broad bands 

 which nearly cover the whorls. The aperture is about half the length of the 



shell. 



VIII. — 2 u 



