FRESH WATER AND LAND SHELLS. 299 



is not usually persistent on the body whorl. It is nearest in form and size to M. percarinata, 

 "on., but may be easily distinguished by the absence of granules between the carina?, 

 he length of the spire, having three or four more whorls, and in being less shining. The 



aperture is not quite one-third the length of the shell. 



Melaxia furva. PI. XXX. Fig. 7. 



Testa Imvi, conoidea, subcrassd furva ; spird subelevatd ; suluris excavalis ; anfractibus planufatis ; aper~ 

 lun'i parvd, subrhomboided, ad basim angiduld, intus purpurea ; columella purpurea tertaque. 



Shell smooth, conical, rather thick, dusky ; spire rather elevated ; sutures furrowed; whorls flattened ; aper- 

 ture small, subrhomboidal, at the base angular, within purplish; columella purple and twisted. 



Hab. Branch of Coosa River, Alabama, Prof. Brumby. 

 My cabinet and cabinet of Prof. Brumby. 

 Diam. .30, Length .84, of an inch. 



Remarks. — A single specimen of this species was received from Prof. Brumby. It has 

 the apex so much eroded as to present only a little more than three whorls, which are, 

 however, perfect, and enable me to distinguish it from its allied species, the nearest of 

 which is M. arata, (Nobis.) The sutures have the same furrowed line, and the sides of 

 the whorl are alike flattened. The aperture, however, differs in form and colour. In the 

 arata the columella is straight down to the channel at the base; in the furva, it is curved 

 to the right and the channel is less marked. The length of the aperture, in perfect speci- 

 mens, must be about one-third the length of the shell. 



The Alexandrengis, (Nobis,) from Louisiana, is very closely allied to this species, and 

 when perfect specimens of both shall be obtained, they may possibly be found to be the 

 same. 



Melania Sellersiana. PI. XXX. Fig. 8. 



Testa plicatd, parvd, conoidea, subcrassd, bruneo-nigricente ; spird subbrevi; suturis linearibus; anfrac- 

 tibus subconvexis ; aperturd magna, elliplicd, ad basim rotundatd, intus purpurea ; columella valde incurvatd. 



Shell folded, small, conical, rather thick, very dark-brown ; spire rather short ; sutures linear ; whorls slightly 

 convex ; aperture large, elliptical, rounded at the base, within purple ; columella very much incurved. 



Hab. Cany Fork, Tennessee, Mr. Coleman Sellers. 



My cabinet and cabinets of Mr. Sellers and Mr. Anthony. 

 Diam. .10, Length .38, of an inch. 



Remarks. — This is an interesting little species, somewhat like M. Nkkliniana, (Nobis,) 

 in its general appearance and size, but is less inflated, and of a darker colour. It might 

 be supposed that its being a plicate shell would at once distinguish it; but the Sellersiana 

 seems to be very variable in the character of its folds, some of the specimens really 

 having none remaining. These may have had folds near the apex, which is now eroded. 

 Some of those before me are beautifully folded down to the last half of the body whorl, 

 the folds being rather large and straight. The surface varies very much; some of the 

 specimens being beautifully mallcate, while on others no such marks can be observed. 

 The outer lip is broken. 



