118 Descriptions of Neiu Fluviatile Shells. 



remarkably elevated, but tapering regularly with a rectilinear 

 outline to the apex, which is entire and acute ; whorls 8, nearly 

 flat, upper ones carinate, and with a well denned suture ; body 

 whorl with a distinct angle, more distinct where it revolves 

 near the top of the aperture ; below this the base is rather con- 

 cave on the columella side ; aperture moderate, narrow, ovate, 

 whitish or faintly tinged with red within ; columella slightly 

 curved, not indented ; sinus slight, but well defined. 



Length 0.56 inch (14 millim.). Diam. 0.25 inch (6 millim.). 



Length of aperture 0.25 inch (6 millim.). 



Breadth of do. 0.13 inch (3 millim.). 



Habitat. — Tennessee. 



My cab. Cab. Lye. Nat. Hist., K Y. 



Obs. — A singularly neat, precise looking shell. Its trim 

 appearance, its pale color, unornamented by any band, and its 

 sharp, well defined angle, amounting almost to a carina, will 

 serve to distinguish it from all others. 



38. Melania tabulata. 



Plate IIL Fig. 18. 



T. ovato-conica, tenui, castaneo-nigra, ; spira parum elevata ; anfr. 5, 

 superioribus, convexia, penultimo piano, superne angulato, ultimo in 

 planis pluribus tabulato ; suturis impressis; apertura elongato-ovata,, 

 ampla, intus purpurea ; columella vix incurva, in sinum inconspicuum 

 producta. 



Shell ovate-conic, smooth, thin, of a dark-brown color ex- 

 ternally ; spire not remarkably elevated, with a rather concave 

 outline ; whorls about 5, upper ones convex, penult whorl flat, 

 body whorl sub-angulated into several planes, with a distinctly 

 mpressed suture; aperture rather large, ovate, within of a 



