Descriptions of New Fluviatile Shells. 



medio elevate carinato ; costa tenui sub carinara revolvente ; apertura 

 rhomboidea, intus carina externa canaliculata, fusco-lineata; columella 

 recta, in sinum acutum producta. 



Shell carinate on the body whorl, rhomboidal; thin, horn- 

 colored ; upper whorls not carinate, but somewhat shouldered ; 

 whorls 5, flat, slightly concave, rapidly diminishing to the apex ; 

 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. 3Ielania proscissa. 



Plate in. 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 producta. 



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

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



