Descriptions of New Fluviatile Shells. 



brown bands on each whorl, except those near the apex, which 

 are carinate ; spire elevated, rising from the broad body whorl 

 with regularly decreasing volume in a pyramidal form to the 

 acute apex ; whorls 10, not convex, with rather indistinct 

 sutures in a furrowed channel ; lines of growth curved and 

 strong, particularly on the penult and body whorl, where they 

 are almost folds ; body whorl distinctly carinated, having one 

 carina at the middle, another a short distance below, with a 

 broad band immediately above the carinae, and another far 

 down, near the base. Aperture small, sub-rhomboidal, whitish 

 within, three bands visible in the interior; columella nearly 

 straight, a little thickened, outer lip very much curved, auger- 

 like ; sinus narrow, recurved. 



Length 0.80 inch (20 millim.). Diam. 0.38 inch (10 millim.). 



Length of aperture 0.32 inch (8 millim.). 



Breadth of do. 0.16 inch (4 millim.). 



Habitat. Tennessee. 



Obs. A fine symmetrical species, which is, perhaps, most 

 nearly allied to M. vestita Con. from that shell it differs in 

 being less ponderous, more acute in its outline, and in its flat 

 whorls, the jM[. vestita being angulated below the middle ; it 

 has also a double band, while "vestita" has a single one. From 

 M. elevata Say it differs by its less slender outline, its want of 

 " thread-like carinas" on the whorls, and its lines of growth are 

 more curved, more elevated, and more distant ; differs from M. 

 spinalis Lea by not having carinated whorls, by its more deli- 

 cate color, and it has not the superior part of the whorl darker 

 than below, as described in M. spinalis. 



34. Ulelaiiia vicina. 



Plate III. Fig. 14. 



T. conica, glabra, subcrassa, fulva ; spira brevi ; anfr. 6, superioribus 

 subconvexis, unifasciatis, ultimo subhumeroso, in medio angulato, fasciis 



