Descriptions of New Fluviatile Shells. 



tinctly striate ; body whorl angulated about the middle, nearly 

 smooth, except as modified by the lines of growth, which are 

 quite distinct, the concentric striae being nearly obsolete on the 

 body whorl ; sutures inconspicuous ; aperture rather large, 

 ovate, whitish within ; columella very slightly rounded, with 

 little or no sinus. 



Length 0.43 inch (11 millim.). Diam. 0.22 inch (5 millim.). 



Length of aperture 0.20 inch (5 millim.). 



Breadth of do. 0.12 inch (3 millim.). 



Habita t. Alabama. 

 My cabinet. 



Obs. This cannot well be confounded with any known 

 species ; its short spire, flat striated whorls, regularly and 

 rapidly decreasing to the apex, the prominent, acute carina 

 which encircles it near the top of the aperture, beneath which 

 the striae, so prominent above, are hardly discernible, and its 

 rather broad form, will readily distinguish it from M. striatula 

 Lea, to which it might seem allied by form and color ; it has 

 somewhat the form of M. vicina nobis, but that shell is more 

 slender, less distinctly carinated, and has not the striation of 

 the present species. 



37. Melania angulata. 



Plate III. Fig. 17. 



T. conica, glabra, fulva ; spira acuta, modice elevata, nigrescente ; 

 anfr. 8, superioribus subplanis, carinis duabus, in anfr. penultimo obso- 

 lescentibus, cinctis, anfr. ultimo in medio acute angulato ; suturis im- 

 pressis ; apertura elongato-ovata, intus albido-rufescente ; columella 

 subincurva. in sinum tenuera producta. 



Shell acutely conic, smooth, brown, rather thick ; spire not 



