FRESH WATER AND LAND SHELLS. 55 
is not usually persistent on the body whorl. It is nearest in form and size to Z. percarinata, 
Con., but may be easily distinguished by the absence of granules between the carine, 
the 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. 
Metania Furva. Pl]. XXX. Fig. 7. 
Testa levi, conoided, subcrassa furvd; spird subelevata; suturis excavatis; anfractibus planulalis ; aper- 
turd parva, subrhomboided, ad basim angulata, intus purpurea ; columella purpurea tortaque. 
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 MZ. 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 Alexandrensis, (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. 
Mexania Sexrersiana. Pl. XXX. Fig. 8. 
Testa plicata, parva, conoided, subcrassa, bruneo-nigricente ; spira subbrevi; suturis linearibus; anfrac- 
tibus subconvexis ; apertura magné, ellipticd, ad basim rotundatd, intus purpured ; columella valdé incurvata. 
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. .16, Length .38, of an inch. 
Remarks.—This is an interesting little species, somewhat like M. Nickliniana, (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 Sedlersiana 
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 malleate, while on others no such marks can be observed. 
The outer lip is broken. 
