124 Desertions of New Fluviatile Shells. . 



4-5, gradatis, vix elevatis, ultimo perrnagno, fuscobilineato ; apertura 

 magna, elongato-ovata ; columella incurva, in sinum tenuem producta. 



Shell short-ovate, smooth, rather thick, light horn-colored ; 

 body whorl large, occupying nearly the entire volume of the 

 shell ; spire nearly flat, consisting of 4-5 perfectly plane whorls, 

 scarcely elevated above the body whorl ; aperture long, nar- 

 row ovate ; columella rounded, ending in a slight sinus. 



Length 0.50 inch (13 millim.). Diam. 0.32 inch (8 millim.). 



Length of aperture 0.36 inch (9 millim.). 



Breadth of do. 0.18 inch (4£ millim.). 



Habitat. — Tennessee. 



My cabinet. Cab. Lye. Nat. Hist., N. Y. 



Obs. — Cannot be confounded with any other species ; its 

 remarkably flat whorls rising like steps, but little above each 

 other, with a distinct and slightly raised rim around the peri- 

 phery, will alone be sufficient to characterize the species. It 

 seems more like an Anculosa in form, but is nevertheless a true 

 Melania. Two bands are visible on the body whorl and also 

 within the aperture. 



45. Melania imriosa. 



Plate III. Fig. 25. 



T. ovata, glabra, suberassa, stramineo-virente ; spira brevi, conicS, ; 

 anfr. 6-7, convexis, rapide crescentibus; ultimo amplo, valde humeroso, 

 interdum obscure fasciato ; suturis impressis ; apertura irregulariter 

 ovata, intus albido-rubescente, srepe purpureo-fafciata ; labro subsinuoso; 

 columella incurva, in sinum latum producta. 



Shell ovate, smooth, olivaceous, moderately thick ; whorls 

 6-7, rapidly converging to the apex, convex ; body whorl 

 ample, with a distinct, but somewhat rounded shoulder ; sutures 



