Descriptions of New Fluviatile Shells, 123 



shoulder of that species ; the bands in the interior are very 

 dark and well defined. 



43. Mclania gJan*. 



Plate IIL Fig. 23. 



T. ventricoso-conica, glabra, crassa, nigro-fusca ; spira acuminata., 

 parum elevata ; anfr. 8, convexis, rapide crescentibus, ultimo magno, 

 perconvexo ; suturis distinctis, albo-lineatis ; apertura, elongata, intus 

 purpurea ; columella foveata, recta, in sinum angustum profundum 

 producta. 



Shell ventricose-conic, smooth, thick, dark-olive ; spire acu- 

 minate, but not elevated ; whorls 8, convex, rapidly converging 

 to the apex ; body whorl very large, rounded beneath ; sutures 

 well defined, white ; aperture not large, elliptical, within dark 

 purple ; columella indented near the base ; sinus well deve- 

 loped. 



Length 0.75 inch (19 millim.). Diam. 0.38 inch (10 millim.). 



Length of aperture 0.34 inch (9 millim.). 



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



Habitat. — Tennessee. 

 My cabinet. 



Obs. — A plain, sombre-looking species, with no very remark- 

 able distinguishing characters, except its large, bulbous form, 

 and dark, purple mouth ; it cannot well be compared with any 

 other species. The whorls are slightly shouldered, with a very 

 narrow, whitish sutural region. 



44-. Melania planospira. 



Plate III. Fig. 24. 

 T. rotundo-ovata, glabra, subcrassa, cornea ; spira, brevissima ; anfr. 



