90 Descriptions of New Fluviatile Shells. 



s. Melania nigrocincta. 



Plate II. Fig. 8. 



T. conica, glabra, tenui, fusca ; spira modice elevata : anfr. 6, supe- 

 rioribus bifa?ciatis et supra suturam subangulatis, ultimo convexo, nigro- 

 4-fasciata ; suturis impressis ; apertura ovata, intiis fasciata ; columella 

 lineari, parum incurva, purpurea, m sinum parvum producta. 



Shell conical, smooth, not much or acutely elevated ; thin, 

 brown, whorls about 6, sub-convex, often slightly angulated 

 near the suture below : sutures impressed ; body whorl not 

 large, a little angulated, ornamented with four very dark bands, 

 the upper and lower of which are distant, and the central ones 

 approximate or confluent: aperture somewhat large, elliptical, 

 banded within ; columella regularly, but not remarkably curved 

 or indented, with a small sinus. 



Length 0.58 inch (15 millim.). Diam. 0.27 inch (7 millim.). 



Length of aperture 0.27 inch (7 millim.). 



Breadth of do. 0.15 inch (4 millim.). 



Habitat. — Tennessee. 



My cabinet. Cab. Lye. Nat. Hist., N. Y. B. W. Budd, M.D. 



Obs. — A rather small species, which, when once seen, will 

 readily be recognised afterwards. Compares with II. suborn- 

 gulata nobis ; it is less robust, more acute, and the bands are 

 of a totally different character ; the texture is quite thin, and 

 the dark bands are distinctly seen in the aperture, through the 

 substance of the shell. It has somewhat of the club-shaped 

 form of that group of shells of which II. clavevformis Lea and 

 M. castanea Lea, are members, but is more angular, and its 

 dark bands and thin texture are prominent differences. 



