61 
Grenus Paludina. — Shell subovatej operculated ; aperture en- 
tire, longitudinally ovate, narrowed above ; lip simple, not dilated 
or reflected. 
Ohs. This genus has been very lately separated by Mr. La- 
marck from the C^clostomse,, with which it corresponds, except in 
having no dilated lip, and the aperture is angulated above. The 
animal has a short rostrum, two acute tentacula with eyes at their 
external base, a small membranaceous wing each side of the body 
before, foot double before, the wing of the right side is folded into 
a small canal, by which the water is introduced into the respiratory 
canal. Latr. To this genus will be referred several of the 
Lymnsea of the American Edition of Nicholson’s Encyclopaedia 
as L. decisa, vivipara and suhcarinata. 
Paludina limosa. — Shell conic, subumbilicate, dark horn 
colored, generally incrusted with a blackish irregular covering on 
the spire, and sometimes on the body, which completely obscures 
the obsoletely wrinkled epidermis ; aperture ovate-orbicular ; suture 
impressed. 
Length three-twentieths, breadth one-tenth, of an inch. Cabi- 
net of the Academy. 
Animal whitish ; head brown ; mouth, tentacula, orbits, and vitta 
on each side of the neck, white ; tentacula filiform, more than half 
as long as the base of the animal ) rostrum about half as long as 
the tentacula, annulate with darker lines above ; foot white, 
brownish above, short, suboval, truncated before, and rounded 
behind. 
Extremely numerous on the muddy shores of the rivers Dela- 
ware and Schuylkill, between high and low water marks. 
[J. A. N. S. vol. i. p. 280, June, 1818.] 
Planorbis glabratus. — Shell sinistral; whorls about live, 
glabrous or obsoletely rugose, polished, destitute of any appearance 
of Carina ; spire perfectly regular, a little concave ; umbilicus large, 
regularly and deeply concave, exhibiting ail the volutions to the 
summit ; aperture declining, remarkably oblique with respect to 
the transverse diameter. 
Breadth nearly nine-tenths of an inch. Inhabits South Caro- 
li na. Cabinet of the Academy. 
