Descriptions of Xew Fluviatile Shells. 



may be considered the type. From that shell it differs, how- 

 ever, in being more elongate, and less ornamented with bands, 

 as well as by its paler and less varnished epidermis. Compared 

 with 2f. proteus Lea it is even more elongate and less acute : 

 the aperture is entirely different, and it wants the tuberculous 

 shoulder which distinguishes that species. Its resemblance to 

 the pupae of some of the insect tribes has suggested its charac- 

 teristic specific name. 



24. Jlelaiiia tecta. 



Plate III. Fig. 4. 



T. conica, tenui, nigro-fusca ; spira elevata ; anfr. 7-8, planis, supra 

 suturas carinatis ; suturis valde impressis ; apertura ovata, intus pur- 

 purascente et obscure fasciata ; columella incurva, in sinum tenuem 

 producta. 



Shell conical, thin, brown ; spire elevated ; whorls 7-8, flat, 

 with a distinct, but not elevated carina on each at its lower 

 edge, near the suture ; sutures very deeply impressed ; aper- 

 ture oval, within reddish and lightly banded ; columella curved, 

 sinus small. 



Length 0.60 inch (15 millim.) Diam. 0.26 inch (6 millim.). 



Length of aperture 0.23 inch (6 millim.). 



Breadth of do. 0.14 inch (3i millim.). 



Habitat Ohio. 



My cab. Cab. Lye. Nat. Hist., K Y. B. W. Budd, M.D. 



Obs. May be compared with Jf. pulchella Anth., but is 

 readily distinguishable by its more slender proportions, thinner 

 texture, lighter color, and above all by its peculiarly shaped 

 whorls, which, increasing regularly, and being carinate at their 

 bases, have somewhat the appearance of the roof of a house, 

 hence its name. Lines of growth distinct ; one or two indis- 



