Descriptions of New Fluviatile Shells. 129 



50. Melania gracilior. 



Plate I. Fig. 5. 



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, incurva, 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. 



