Descriptions of New Fluviatile Shells. 



unlike a Paludina, to which genus its pale uniform green color 

 also seems to ally it. I am not sure that it should not be re- 

 ferred to that genus. It cannot be compared with any known 

 species. 



12. Melania ampla. 



Plate II. Fig. 12. 



T. ovato-conica, glabra, tenui, fulvo-virente ; spira obtuse elevata ; 

 anfr. 5-0, subconvexis, superioribus viridi unifasciatis, ultimo amplo, 

 convexo, viridi 4-fasciato ^ suturis irregulariter profunde impressis ; 

 apertura rnagna, ovata, intiis rubescente, purpureo-fasciata ; columella 

 par urn incurva, subfoveata, inferne subeffusa. 



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 H. 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" Although in some points, and 

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



