Descriptions of New Fluviatile Shells. 



small, pyriform, purple within ; columella and outer lip much 

 twisted together, forming a broad, rather deep, reflexed sinus 

 at base. 



Length 0.90 inch (23 millim.). Diam. 0.30 inch (7 millim.). 



Length of aperture 0.30 inch (7-J- millim.). 



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



Habitat. Alabama. 

 My cabinet. 



Obs. A fine symmetrical species, which seems to have no 

 affinities so close as to be easily confounded with any other. 

 Its^most prominent characters, perhaps, are the nearly uniform 

 diameter of the two or three lower whorls, while above these 

 the spire curves more rapidly to the rather acute apex, and the 

 dark purple aperture. These two points will readily serve to 

 distinguish it. 



4. Melania iota. 



Plate II. Fig. 4. 



T. conica, glabra, corneo-virente ; spira acuta, elevata; anfr. 10, supe- 

 rioribus carinatis, inferioribus convexis ; suturis impresses ; apertura 

 elongato-ovata, intus albida ; columella rosea, incurva, in sinuin angus- 

 tum produ'cta. 



Shell conical, smooth, greenish horn-colored ; spire acutely 

 elevated ; whorls about 10, lower ones convex, upper whorls 

 with a strong carina below the middle ; sutures impressed ; 

 aperture pyriform, small, within whitish ; columella but little 

 rounded, not indented, sinus very small. 



Length 0.78 inch (20 millim.). Diam. 0.25 (6 millim.). 



Length of aperture 0.26 inch (7 millim.). 



Breadth of do. 0.15 inch (4 millim.). 



