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it resembles armifera, nob., more than any other species, but that 
shell is armed with tubercles and ornamented by colored lines ] its 
suture also is only a simple impressed line. 
Melania laqueata. — Shell oblong : spire longer than the 
aperture, elevated^ conic, acute ; volutions moderately convex, with 
about seventeen regular, elevated, equal, equidistant costse on the 
superior half of each volution extending from suture to suture, and 
but little lower, and becoming obsolete on the body whirl : suture 
moderately impressed : sinus obsolete. 
Length, four-fifths of an inch. 
This species was found by Dr. Troost in Cumberland River. 
Aside from a difierence in form, it may be distinguished from can- 
cellataj nob., and cateiiaria, nob., by being altogether destitute of 
elevated revolving lines. The young shell is carinated. I am in- 
debted to Mr. Lesueur for a specimen. 
Melania obovata. — Shell subovate, dark brown or blackish ; 
volutions nearly five : spire remarkably rounded, short : body whirl 
with a very obtuse, slightly indented band or undulation a little 
above the middle : aperture more than twice the length of the 
spire, narrow : labium polished, with a callus above : lab rum not 
projecting near the base, subrectilinear from the shoulder to the 
basal curve, very convex at the shoulder ) base rounded and with- 
out indentation. 
Animal . — Foot rounded, or rather longer than wide, equally 
rounded before and behind ; above yellowish-white, lineated with 
black lines. 
Inhabits Kentucky River, and some other tributaries of the 
Ohio. Length, three-fourths; breadth, nearly half an inch. Var. 
a. Indented band almost obsolete. 
The spire, and even a part of the body whirl in old shells, are 
sometimes remarkably eroded, as in the M. (anculosa) prserosa, nob., 
and,indeed, the general appearance is such, that at a little distance, 
and without particular observation, it might be readily mistaken 
for that shell ; but the form is less globular and the aperture is 
altogether different. I found it very abundant in Kentucky River, 
in company with that shell and other species of Melania. I also 
observed it at the Falls of the Ohio. Lesueur and Troost obtained 
specimens in Fox River of the Wabash. When young, the undu- 
