Descriptions of New Fluviatik Shells. 129 



50. Iflelania gracilior. 



Plate I. Fig. 6. 



Melania gracilis Anthony (not Lea), Haldeman's Monog. Fresh-Water Shells of 

 North America, Cover of No. 4. 



T. conica, glabra, fusco-nigrescente ; spira elevata ; anfr. 8, superiori- 

 bus planis, ultimo infra suturam constricto, et fascia fulvo-virente cincto ; 

 suturis impressis, pallidioribus ; apertura ovata, intus fasciata ; labro 

 sinuato ; columella fusca, iucurva, in sinum distinctum producta. 



Shell conical, smooth, and shining, color dark-brown, texture 

 light ; whorls about 8, upper ones nearly flat, the last is usually 

 slightly constricted beneath the suture, and beneath this stric- 

 ture, on the periphery of the last whorl, revolve one or two 

 broad bands of yellowish-green; sutures impressed, and of 

 paler color than the rest of the shell ; aperture small, pyriform, 

 and inwardly ornamented with alternate bands of a dark ruby 

 color and translucent white, which render this part of the shell 

 peculiarly lively and beautiful ; outer lip sinuate ; columella 

 dark brown, arcuate, and produced into a distinct sinus. 



Length 0.75 inch (19 millim.). Diam. 0.28 inch (7 millim.). 



Length of aperture 0.25 inch (6 millim.). 



Breadth of do. 0.17 inch (4 millim.). 



Habitat. Congress and Springfield Lakes, Stark county, 

 Ohio. 

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



Obs. This is a very distinct and beautiful species, remark- 

 able for its long slender form, its polished surface, and for a 

 profound stricture on the body whorl of many of the specimens, 

 though this last character is not always present; when it is 

 present, it furnishes a mark by which this species can be readily 

 distinguished from any other. 



