Descriptions of New Fluviatile Shells. 



Obs. I know no species with which, the present one can 

 easily be confounded ; its short, rather broad outline, with its 

 thick, prominent, longitudinal ribs on the short whorls of the 

 spire will readily distinguish it. Six specimens only are before 

 me, three of which are banded, and three are plain ; the speci- 

 mens are otherwise very uniform in appearance. 



48. Tflelaiiia corpuleiita. 



Plate III. Fig. 28. 



T. ovata, glabra, fulvo-virente ; spira hrevi, convexo-couica ; anfr. 6 

 *7, convexis, ultimo subcylindrico, inferne subangulato, fasciis nigris latis 

 duabus cinctis ; suturis valde impressis ; apertura elongato-ovata, su- 

 perne angusta, intus fasciata ; columella primura recta, deinde in sinum 

 profundum recurvata. 



Shell ovate, smooth, yellowish, banded ; whorls 6-7, convex ; 

 body whorl very full, with two distant dark-brown bands 

 quite broad, which are nearly concealed on the upper whorls 

 by the revolutions of the spire ; sutures impressed ; aperture 

 narrow ovate, broadest at base, banded within; columella much 

 curved below the middle, white, and thickened at base, with a 

 broad and distinct sinus in that region. 



Length 0.80 inch (20 millim.). Diam. 0.42 inch (10 millim.). 



Length of aperture 0.40 inch (10 millim.). 



Breadth of do. 0.17 inch (4 millim.). 



Habitat. Alabama. 

 My cabinet. 



Obs. Its most prominent character is the corpulence of the 

 body whorl, and its regular oval form. May be compared with 

 M. bitctniata Con., but its body whorl is much more rounded or 

 oval, it is less banded, and the bands are more distinct ; the 

 spire is more elevated and less abrupt. 



