94 Descriptions of New Fluviatih Shells. 



convexo, viridi 4-fasciato; suturis irregulariter profuncle impressis; 

 apertura magna, ovata, intus rubescente, purpureo-fasciata ; columella 

 pariim incurva, subfoveata, inferne subefl'usa. 



Shell ovate-conic, smooth, thin ; spire obtusely elevated ; 

 whorls 5-6, sub-convex; body whorl ample, surrounded with 

 four dark greenish bands ; sutures irregularly and deeply im- 

 pressed ; aperture large, ovate, within roseate and banded; 

 columella rounded, slightly indented, and a little effuse at base. 



Length 1.25 inch (32 millim.). Diam. 0.58 inch (15 millim.). 

 Length of aperture 0.58 inch (15 millim.). 

 Breadth of do. 0.30 inch (8 millim.) 



Habitat. — Alabama. 

 My cabinet. 



Obs. — Compared with M. olivula Con., it is a larger, much less 

 solid species, the epidermis is thinner, less polished, and has 

 not the finely contrasting colors which render M. olivula so 

 lively and pleasing ; differs from M. fuliginosa Lea in being far 

 less ponderous, with fewer and less distinct bands, by the dis- 

 tinct angle passing round the shell near the top of the mouth, 

 and by its capacious aperture ; which two last points apply 

 with equal force to " olivula.''' 1 Although in some points, and 

 particularly in its ample mouth, it resembles M. florentina Lea, 

 it has not the shouldered whorls and tubercular armature which 

 distinguish that beautiful species. 



The bands within the aperture do not reach its outer edge, 

 but a broad, plain area is left between. 



13. ITIelania ambusta. 



Plate II. Fig. 13. 



T. ovata, glabra, subtenui, castanea ; spira obtuse elevata, anfr. 6 

 subconvexis, ultimo magno, substriato; suturis impressis; apertura 



