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widely and regularly rounded, without any protrusion near the 
base : base slightly angulated, without any sinus or undulation : 
umbilicus none. 
Inhabits Falls of the Ohio. Length, less than half an inch. 
Var. a. Inferior band obsolete. Yar. h. Bands obsolete. 
This species is allied to the preceding, but is obviously dis- 
tinct in its general appearance ; '.the volutions are destitute of a 
shoulder, and the aperture is ovate, acute above. It is a pretty 
shell, the bands being very conspicuous, strongly contrasting with 
the yellow general color, particularly in the young and half grown 
/ shell. 
I obtained about a dozen specimens on the rocky flats of the 
Falls of the Ohio, at the lower end of the island which is nearest 
to Louisville. 
Melania depygis. — S hell oblong conic ovate, not remarkably 
thickened : spire as long as the aperture, or rather longer, much 
eroded, with a broad revolving band near the suture, occupying 
more than half the surface : whirls about flve, hardly rounded : 
suture moderately impressed : body whirl yellowish, with two 
equidistant rufous, revolving lines, of which the superior one is 
much broader and its locality a little flatter than the general cur- 
vature : aperture ovate, acute, above, moderately dilated : labium 
with calcareous deposit, particularly above : labrum not projecting 
near the base, nor arquated near its junction with the second volu- 
tion : base regularly rounded. 
Inhabits Falls of the Ohio. Length half an inch ; breadth, 
nearly a quarter of an inch. Yar. a. Color dark brown; bands 
obsolete. 
I found this species in great abundance on the rocky flats at the 
Falls of the Ohio, where they were left by the subsiding of the 
river, in company with numerous other shells. In old specimens 
the spire is very much eroded ; the eroded part is white. 
Paludina transversa. — S hell transverse, depressed, orbicu- 
lar : spire convex : whirls three and a half; with numerous minute, 
slightly elevated revolving lines : suture not widely indented : body 
whirl very convex, short : umbilicus small : operculum pale fulvous- 
G-reatest width, two-fifths of ah inch. Inhabits Louisiana. 
We obtained two specimens in the marshes near New Orleans. 
It is much wider in proportion to the length than any other species 
