182 DESCRIPTION OF 



The specimens received from both Dr. Troost and Dr. Currey, were covered 

 with a deposits of the oxide of iron, giving them a black hue. Under this the 

 epidermis is yellow. The aperture is about one-third the length of the shell. 



Melania nitens. Plate 6, Fig. 40. 



Testa plicatd, suhcrassa, tenebroso-fusca ; spird obtusd; suturis impressis; anfractihus septenis, 

 subconvexis ; aperturd parvd, ellipticd, ad basim angulatd, intus subrufd. 



Shell folded, somewhat thick, dark brown ; spire obtuse ; sutures impressed ; whorls seven, somewhat; 

 convex ; aperture small, elliptical, angular at the base, reddish within. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .30, Length .76 of an inch. 



Remarks. — This is a shining, dark brown species, with rather regular ribs 

 on the superior whorls. The aperture is about one-third the length of the shell. 

 A single specimen only was received. 



Melania plicatula. Plate 6, Fig. 41. 



Testa plicatd, conoided, tenui, tenebroso-corned ; spird subelevatd; suturis impressis; anfractibus oc- 

 tonis, subconvexis, superne striatis; aperturd parvd, ellipticd, ad basim. subangulatd, intus albidd. 



Shell folded, conical, thin, dark horn colour; spire rather elevated ; sutures impressed; whorls eight, 

 rather conve.x, striate above; aperture rather small, elliptical, at the base somewhat angular, within 

 whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinets of Dr. Troost and Mr. Edgar. 

 Diam. .35, Length .85 of an inch. 



Remarks. — Dr. Troost and Mr. Edgar both procured this species from 

 Tennessee, but their labels do not state the district. The ribs are numerous 

 and close, and most individuals have two striae above, which, crossing the ribs, 

 produces a granulation. The mouth is about one- third the length of the shell. 



