188 DESCRIPTION OF 



Remarks. — Dr. Troost sent me a single specimen of this species which is 

 very distinct. The columella is very much thickened, particularly above, in 

 which it resembles the genus Melanopsis. The aperture is rather more than 

 half the length of the shell. In this specimen a single obscure band may be 

 observed within, close to the base of the columella. 



Melania Florentiana. Plate 6, Fig. 53. 



Testa, tuberculatd, ellipticd, ponderosd, pallida; spird ohtusd; suturis impressis; anfractibus senis, 

 subconvexis ; aperturd productd, albidd. 



Shell tuberculate, elliptical, ponderous, pale; spire obtuse; sutures impressed; whorls six, slightly con- 

 vex; aperture elongated, whitish. 



Hab. Tennessee River, Florence, Alabama. T. R. Button. 

 My Cabinet, and Cabinet of Mr. Dutton. 

 Diam. .47, Length .87 of an inch. 



Remarks. — An elliptical species resembling the M. olivula, Conrad. Its 

 aperture is so much elongated as to be more than half the length of the shell. 

 Three of the specimens are without bands, a fourth has several very indistinct 

 ones. The whorls are somewhat flattened on the superior part and are disposed 

 to be tuberculaied below the sutures. In the young the tubercles are more dis- 

 tinct. In some of the adult specimens they are entirely wanting. 



Melania Dutton iana. Plate 6, Fig. 54. 



Testd tuberculatd, fusiformi, subcrassd, luteold, fasciatd; spird elevatd, ad apicem acuta; suturis 

 enormiter linealis; anfractibus septenis, supernt depressis; aperturd productd, ad basim angulatd et 

 canaliculatd, intus albidd. 



Shell tuberculate, fusiform, rather thick, yellowish, banded ; spire elevated, pointed at the apex ; sutures 

 irregularly lined; whorls seven, depressed above; aperture elongated, angular and channelled at the base, 

 within whitish. 



Hab. Waters of Tennessee. Dr. Troost. Duck River, Maury Co., Tenn. 

 T. R. Dutton. 



My Cabinet, and Cabinets of Prof. Troost and Mr. Dutton. 

 Diam. .57, Length 1.09 of an inch. 



