Descriptions of New Fluviatile Shells. 109 



sutures not remarkable ; body whorl with a strong, well deve- 

 loped carina extending from the upper part of the aperture, 

 and revolving 'round so as to be at its centre when it reaches 

 the mouth again. The carina, and a smaller one below it, are 

 indicated in the interior by a grooved channel with a dark band 

 running through it. Aperture rhomboidal, banded within. 

 Columella straight, with an acute sinus at base. 



Length 0.50 inch (13 millim.). Diam. 0.34 inch (9 millim.). 



Length of aperture 0.30 inch (8 millim.). 



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



Habitat. — Alabama. 



Obs. — Only one specimen of this remarkable species has 

 come under my notice, but it is so widely different from all 

 others that no one can for a moment doubt its distinctive 

 character. The upper whorls are obscurely banded near the 



suture. 



29. JTIelaniji proscissa. 



Plate III. Fig. 9. 



T. rotundo-ovata, subcrassa, fusca ; spira brevi ; anfr. 5 \ convexis, 

 superioribus bicarinatis, ultimo carinis acutis 4 vel 5 cincto ; suturis 

 linearibus; apertura ovata, intus 5-lineata; columella incurva, foveata, 

 purpureo tincta, in sinum tenuem products.. 



Shell ovate, rather thick, brown; whorls supposed to be 

 about 5, rather convex ; body whorl surrounded by about 5 

 carina?, of which two central ones are more prominent ; sutures 

 linear ; aperture large, ovate, exhibiting the elevated ridges on 

 the body whorl, as linear, brown bands seen through the sub- 

 stance of the shell ; columella rounded, deeply indented, having 

 a small purple spot below the middle, with a slight sinus at 

 base. 



