NEW FRESH WATER AND LAND SHELLS. 15 
Iam not aware, of this genus having been observed out of the United States. There 
have been seventeen species described, nearly all of which will stand, and I now propose 
to add four to that number. 
Ancuosa TROOSTIANA. 
Testd ovato-conicd, crassa, minut? rugosd, tenebroso-fuscd; spird subelevatd; suturis subimpressis; anfractibus 
planulatis; aperturd rotunda, intus ceruled; columelld crassa, vel alba vel carned. 
Shell ovately conical, thick, minutely rugose, dark brown; spire somewhat elevated; sutures rather impressed; whorls 
flattened; aperture rounded, within bluish; columella thick, white or flesh-coloured. 3 
Hab. Tennessee, Professor Troost. My Cabinet, and Cabinet of Professor Troost. Diam. .50, 
Length .60 of an inch, 
Remarks.—There are many specimens before me, all of which in form are unusually 
alike, for a species of Anculosa. It differs from other species which have come under my no- 
tice, in its spire, which is quite elevated, giving it the aspect of the genus Me/ania. Small 
irregular wrinkles, or granulations, may be observed over the whole surface in most spe- 
cimens, and I believe this will generally be found to be more or less the case with most 
of the species. 
ANCULOSA GIBBOSA. 
Testd subglobosd, gibbosd, crassd, subnigrd, crebré striata; spird brevis suturis impressis; anfractibus subplanu- 
latis; aperturd subquadrangulari, vel carned vel albidd. 
Shell subglobose, gibbous, thick, nearly black, thickly striate; spire short; sutures impressed; whorls rather flattened ; 
aperture subquadrangular, flesh-coloured or whitish. 
Hab. Tennessee. Professor Troost. My Cabinet, and Cabinet of Prof. Troost. Diam, .50, Length 
.68 of an inch, 
Remarks.—This species is about the size of An. subglobosa, (Say.) It is not so regularly 
rounded, -being flattened on the upper part of the whorl. ‘The strie are minute, and seem 
to be formed by the lines of erowth. There is quite a callus on the superior part of the 
columella, the middle part being deeply impressed. ‘The number of whorls could not be 
ascertained from my specimens, all of them being more or less eroded. 
ANCULOSA CARINATA. 
Testd ovato-conoided, carinatd, tenebroso-olivaced; spird breviusculd; suturis parvis; anfractibus senis; aperturd 
pared, rotunda, intus albidd, sulcatd; columelld subcrassd, purpurea. 
Shell ovately conical, carinate, dark olive; spire rather short; sutures small; whorls six; aperture small, round, within 
whitish, sulcate; columella rather thick, purple. 
Hab, Roanoke River, Lafayette. J. A. Warder, M.D. My Cabinet, and Cabinet of Dr. Warder. 
Diam. .38, Length .52 of an inch. 
Remarks.—A single specimen only of this interesting species was sent to me by Dr. 
Warder. It has some resemblance to Anculosa dissimilis, (Say.) It differs in having a 
smaller and rounder aperture, and in having three carine, the middle one being the 
largest. The aperture is rather more than one-third the length of the shell. The 
carine are acute. 
ANCULOSA VARIABILIS. 
Testd obtuso-conoided, crassa, vel fasciatd vel corned vel carinatd vel levi; suturis linearibus; anfractibus senis, 
planulatis; aperturd magni, subrotundd; columella crassa, vel albd vel purpured. 
Shell obtusely conical, thick, either banded or horn-coloured, carinate or smooth; sutures linear; whorls six, flattened; 
aperture large, nearly round; columella thick, white or purple. 
