18 DESCRIPTION OF 
Hab. Vicinity of Cincinnati. T,G, Lea. My Cabinet and Cabinet of T, G, Lea, Diam. .06, Length 
-04 of an inch. 
Remarks.—This is the smallest species, in our country, which has come under my no- 
tice. Its very minute longitudinal striee can only be observed by a powerful lens. The 
umbilicus is rather large and deep. It is nearly the form of HL labyrinthica, (Say,) but 
is a smaller species, is differently striated, and has no teeth. My brother sent me three 
Specimens, which he informs me were found under wet sticks, and on the margin of a 
pond. 
MELANIA TURGIDA. 
ig A s * A . A A . A 7 A . . . A > » ° . 
Testé levi, obtuso-conicd, inflata, crassd, fasciatd; spird brevi, ad apicem acuminata; suturis leviter impressis; an- 
Sractibus septenis, planulatis; apertura parva, Sormam trapezti habente; columella incrassatd, alba. 
Shell smooth, obtusely conical, inflated, thick, banded ; spire short, pointed at the apex; sutures slightly impressed ; 
whorls seven, flattened; aperture small, trapezoidal; columella thickened, white. 
Hab. Holston River, East Tennessee, Prof, Troost, and S. M. Edgar. My Cabinet, and Cabinets of 
Prof. Troost and S, M. Edgar. Diam. .35, Length .55 of an inch. 
Remarks.—This is a very short and thick species, having a very large body whorl dis- 
posed to be obtusely angular at the middle. The number of bands varies. One of the 
specimens has a single one, another has two bands, and five have five bands, there being 
seven specimens before me. That-witha single band is of a bright yellow; the others are 
of agreenish yellow. The aperture is nearly one-half the length of the shell, and twisted 
at the base. 
MELANIA GLABRA. 
Testa levi, conoided, subtenui, nitidd, tenebroso-castaned; spird subelevatd; suturis leviter impressis; anfractibus 
subplanulatis; aperturd elongata, Sormam trapexii habente, intus purpurea; columella incurva. 
Shell smooth, conical, rather thin, shining, dark chestnut colour; spire rather elevated; sutures slightly impressed; 
whorls rather flattened; aperture elongated, trapezoidal, purplish within, columella incurved. 
Hab. Holston River, East Tennessee, Prof. Troost, and S. M, Edgar. My Cabinet, and Cabinets of 
Prof. Troost and Mr. Edgar. Diam. -32, Length .70 of an inch, 
Remarks.—The apex in all the specimens before me is slightly eroded, and therefore 
the number of the whorls cannot be accurately ascertained; it may be six or seven. The 
aperture is more than one-third the length of the shell. The superior whorls are dis- 
posed to be carinate, and below the sutures the colour is lighter. 'The columella is much 
incurved. Within the aperture, indistinct confluent bands may be observed. These are 
scarcely observable without, but give the shell a very dark aspect, somewhat like M. rufa, 
(nobis.) It is very different, however, in form, from that Species. 
MELANIA PERFUSCA. 
Testé levi, conoided, subcrassd, tenebroso-fuscd; spird easertd; suturis linearibus; anfractibus subplanulatis; aper. 
turd grandt, inflata, ovatd, intus pallido-purpured, 
Shell smooth, conical, rather thick, dark brown; spire exserted; sutures linear; whorls rather flattened; aperture large, 
inflated, ovate, within pale purple. 
Hab. Calf-killer Creek. Tennessee, §. M, Edgar, My Cabinet and Cabinet of Mr. Edgar. Diam, 
.50, Length 1 inch. 
Remarks.—A. single specimen, with the spire truncate, is before me. 'The lower por- 
tion is perfect. The apex being destroyed, the number of whorls cannot be ascertained. 
