86 Descriptions of New Fluviatile Shells. 



4. Melania iota. 



Plate II. Fig. 4. 



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

 rioribus carinatis, inferioribus convexis ; suturis impressis ; apertura 

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

 tum producta. 



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.). 



Habitat. . 



My cabinet. Cab. Lye. Nat. Hist., K Y. 



Obs. — A beautiful, slender, graceful species, in form not 

 unlike M. percarinata Con. and perangulata Con., but differs 

 from both in coloring, in the want of a crenulated or beaded 

 line on the volutions, and in other respects. The upper whorls 

 are often obscurely folded down to the carina on each, where 

 they are arrested ; below the carina the whorls shelve towards 

 the suture, which thus becomes situated in a deep furrow. 

 It cannot be confounded with M. elevata Say, which has flat 

 whorls, a dark epidermis, and a totally different aperture. 

 The columella of the present species is faintly tinged with 

 purple. I am not quite sure as to the habitat of this species, but 

 think it an Ohio shell. 



