112 Descriptions of New Fluviatile Shells. 



base ; outer lip angularly curved, extended forwards ; sinus 

 rather broad, not deep. 



Length 1.37 inch (34 millim.). Diam. 0.40 inch (12 millim.). 



Length of aperture 0.40 inch (10 millim.). 



Breadth of do. 0.24 inch (6 millim.). 



Habitat. — Alabama. 

 My cabinet. 



Obs. — A stout species, which most resembles If. regularis Lea 

 in general appearance, from which, however, its concave whorls, 

 elevated carina, and dark band will readily distinguish it. It 

 has not the channelled body whorl of If. canaliculata Say, nor 

 the convex, subangulated upper whorls which distinguish that 

 species. 



The lines of growth, are very coarse and prominent, and ex- 

 tending over the raised line near the base of the whorls, give 

 the latter an interrupted or subcrenulated appearance. 



32. Melaiiia graclafa. 



Plate III. Fig. 12. 



T. conica, glabra, crassa, corneo-virente ; spira parum elovata ; anfr. 

 7-8, gTadatis, subconcavis, funiculo coiippieuo suturas incumbente et in 

 anguluin anfr. ultimi carinam elevante ; suturis valde impressis ; apertura 

 subrliomboidea, intiis albida ; labro prorsum valde sinuato, columella 

 recta, in sinum angustum profunduni products. 



Shell conical, smooth, solid, greenish horn-color ; spire not 

 much elevated ; whorls 7-8, slightly concave, with a distinct 

 elevated ridge, closely overlying the suture and the projecting 

 shoulder of the succeeding whorl so as to form a series of 

 steps to the sub-acute apex ; body whorl large, generally an- 

 gulated or distinctly ribbed at base, which is not much rounded ; 

 sutures impressed ; aperture subrhomboidal, whitish within ; 



