NEW FRESH WATER AND LAND SHELLS. 179 



Melania COLUMELLA. Plate 6, Fig. 33. 



Testa obscuro-plicatd, conoided, subtenui, corned; spird subelevatd, prope apicem striata; suturis 

 impressis; anfractibus senis, subconvexis ; aperturd parvd, ellipticd, inferne angulatd, albidd. 



Shell obscurely plicate, conical, rather thin, horn colour; spire rather elevated, striate towards the apex; 

 sutures impressed; whorls six, somewhat convex; aperture small, elliptical, angular at base, whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .26, Length .63 of an inch. 



Remarks. — This species is remarkable for the impressed curve on the colu- 

 mella. In its general character it resembles the M. Uanda herein described. 

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



Melania blanda. Plate 6, Fig. 34. 



Testa plicatd, conoided, subtenui, nitidd, corned; spird subelevatd, prope apicem striatd; suturis im- 

 pressis; anfractibus septenis,subplanulatis; aperturd parvd, ellipticd, infernd angulatd, albidd. 



Shell folded, conical, rather thin, shining, horn colour; spire rather elevated; towards the apex striate; 

 sutures impressed; whorls seven, rather flattened; aperture small, elliptical, angular at the base, whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .26, Length .69 of an inch. 



Remarks. — A single specimen of this species was received from Dr. Troost. 

 The folds are obscure and the striae small. The aperture is not quite one-third 

 the length of the shell. 



Melania crebri-costata. Plate 6, Fig. 35. 



Testa crebri-plicatd, conoided, subcrassd, corned; spird elevatd; suturis linearibus; anfractibus sep- 

 tenis, planulati.i; aperturd parvd, ellipticd, inferne angulatd, cceruled. 



Shell closely folded, conical, rather thick, horn colour; spire elevated; sutures linear; whorls seven, flat 

 tened; aperture small, elliptical, below angular, bluish. 

 VIII. — 2 V 



