190 DESCRIPTION OF 



Remarks. — A fine cancellate species with ten or eleven revolving striae on the 

 body whorl, crossing the folds. The aperture is about one-third the length of 

 the shell. It nearly answers to Mr. Conrad's description of M. nassula, but 

 has five striae on the penultimate whorl while the nassula has seven. It differs 

 from M. catenaria, Say, in having a more elevated spire, and in having two or 

 three more revolving strise. In some individuals the aperture is bluish white. 



Melania nodulosa. Plate 6, Fig. 57. 



Testa cancellatd, conoided, crassd, tenebroso-fuscd ; suturis enormiter impressis; anfractihus subcon- 

 vexis; aperturd subgrandi, ellipticd, infra subangulatd, intus cceruled. 



. Shell cancellate, conical, thick, dark brown; sutures irregularly impressed; whorls somewhat convex ; 

 aperture rather large, elliptical, subangular below, within bluish. 



Hab. Tenn, Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .34, Length .82 of an inch. 



Remarks. — Two imperfect specimens only were received from Dr. Troost, 

 and both are much eroded at the apex, consequently the number of whorls 

 could not be ascertained. The body whorl has about twenty well defined 

 raised strise, which on the superior part are crossed by folds causing numerous 

 elevated points, giving the whole of the upper part of the shell a granulate 

 appearance. It is somewhaOikeJVf. catenaria, Say, but may be distinguished 

 at once by the number of striae. 



Mead December 21sf, 1838. 

 Melania Cincinnatiensis. Plate 6, Fig. 58. 



Testa carinatd, valde. depressd, inferne compressd, fused, trifasciatd, bicarinatd, apice acuminatd; 

 anfractibus quatemis; aperturd subrotundd. 



Shell carinate, much depressed, below compressed, brown, three-banded, with two carinte, pointed at 

 the apex; whorls four; aperture rounded. 



