176 DESCRIPTION OF 



Melania tenebrosa. Plate 5, Fig. 26. 



Testa IcBvi, conoided, suhcrassa, suhnigra; spird subelevatd; suturis impressis; anfractibus planulatis ; 

 aperturd subgrandi, ellipticd, ad basim angulatd, intus cceruled. 



Shell smooth, conical, rather thick, nearly black; spire rather elevated; sutures impressed; whorls flat- 

 tened; aperture rather large, elliptical, at the base angular, within bluish, 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .30, Length .72 of an inch. 



Remarks. — Two specimens of this species were sent to me by Dr. Troost, 

 both of which are decollated. On one there is a slight disposition to striae on 

 the upper remaining whorl. In general outline it resembles a small Virginica, 

 Say. 



Section II. — Plicate Melanije. 

 Melania teres. Plate 5, Fig. 27. 



Testa plicatd, acuto-turritd, tenui, corned; spird exsertd; suturis impressis; anfractibus novenis, 

 convvxis; aperturd parvd, ellipticd, intus albidd. 



Shell folded, acutely turrited, thin, horn-coloured; spire drawn out; sutures impressed; whorls nine, con- 

 vex; aperture small, elliptical, within whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinets of Dr. Troost, and P. H. Nicklin. 

 Diam. .25, Length .87 of an inch. 



Remarks. — This is a remarkably elevated species, with the whorls much 

 inflated, and the last whorl very small. Some of the specimens before me are 

 but obscurely folded. 



Melania obtusa. Plate 5, Fig. 28. 



Testa plicatd, fusiformi, subcrassd, corned; spird obtusd; suturis impressis; anfractibus quaternis, 

 ultimo semi-plicato ; aperturd magnd, albidd. 



