Descriptions of New Fluviatile Shells. 97 



15. llelaiiia eliminata. 



Plate II. Fig. 15. 



T. elongato-conica, tenui, castanea ; spira gracili, elevata ; anfr. 8, 

 convexis transverse plicatis et spiraliter striatis, plicis striisque in anfr. 

 inferioribus evanescentibus : suturis impressis ; apertura parva, ovata, 

 purpurascente ; labro sinuoso; columella incurva, in sinum angustum 

 producta. 



Shell conic, thin, brownish ; spire slender, elevated ; whorls 

 about 8, convex, with transverse folds and spiral striae, both 

 of which, however, disappear towards the lower portion of each, 

 whorl, and are hardly visible on the last whorl ; sutures deeply 

 impressed ; aperture small, ovate, within translucent, exhibiting 

 the exterior coloring through its substance ; columella but little 

 rounded except near its base, where with the much curved lip 

 it forms a sharp, narrow sinus. 



Length 0.80 inch (21 millim.). Diam. 0.24 inch (6 millim.). 



Length of aperture 0.26 inch (7 millim.). 



Breadth of do. 0.15 inch (4 millim.). 



Habitat. — Kentucky, near Owenboro'. 

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



Obs. — This is a very slender and elevated species, resembling 

 in this respect M. comma Con., from which it differs very ma- 

 terially by the character of its folds and strife, which are more 

 decided, being nearly as prominent, though less distant, than 

 in M. Curryana Lea ;. the stria? revolve round the whorls and 

 over the ribs without being interrupted by them ; differs from 

 M. Edgariana Lea, by its brown color, more slender form, less 

 convex whorls, and thinner texture; it is more slender than 

 M. decora or costulata, and less acute, the whorls tapering more 

 gradually to the apex ; on the upper whorls there are about 

 five striae, the lowest of which is much more elevated than the 



