184 DESCRIPTION OF 



Shell carinate, conical, rather thick, black ; sutures rather deeply grooved ; whorls flattened, carinate ; 

 aperture small, at the base angular and channelled, dark within. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .28, Length .67 of an inch. 



Remarks. — I received only two specimens of this species, both of which are 

 decollated. It is perfectly distinct, and remarkable for its jetty hue, its carina, 

 and its deeply impressed sutures, which are caused by the carina. 



Melania Potosiensis. Plate 6, Fig. 45. 



Testa carinatd, conoided, subtenui, fused ; spird ohtuso-elevatd ; suturis valde impressis; anfractibus 

 octonis, convexis; aperturd magna, ovatd, purpuratd. 



Shell carinate, conical, rather thin, brown; spire obtusely elevated; sutures much impressed ; whorls 

 eight, convex ; aperture large, ovate, purplish. 



Hab. Potosi, Missouri. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .28, Length .62 of an inch. 



Remarks. — The rotundity of the outer lip in this is different from the 

 species generally, with the same elevation of spire. The aperture is more 

 than one-third the length of the shell, and is entirely purple, in the only two 

 specimens before me. In one specimen the carina is distinct on all the 

 whorls but the last, in the other it is not visible on/ the last two whorls. 



Melania acuto-carinata. Plate 6, Fig. 46. 



Testa carinatd, conoided, subcrassd, nitidd, tenebroso-fuscd; spird ohtuso-elevatd; suturis impressis; 

 anfractibus senis; aperturd subgrandi, ellipticd, inferne angviatd, intus purpuratd. 



Shell carinate, conical, rather thick, shining, dark brown ; spire obtusely elevated ; sutures impressed ; 

 whorls six; aperture rather large, elliptical, angular at base, purplish within. 



Hab. Tenn. Dr. Currey. 



My Cabinet, and Cabinet of Dr. Currey. 

 Diam. .30, Length .66 of an inch. 



