NEW FRESH WATER AND LAND SHELLS. 13 
Hab, Oahu. Prof. Nuttall. My Cabinet, and Cabinet of Prof. Nuttall. Diam. .20, Length .35 of 
an inch, 
Remarks.—This is a small species procured by Prof. Nuttall during his sojourn at the 
Sandwich Islands. It is rather smaller than Say’s modicella, but may be distinguished 
by its reddish colour, bright surface and distinct fold. The aperture is more than half 
the length of the shell. The lip is margined by a red line on the inside where the spe- 
cimen is mature. Some individuals are covered by a deposite of ferruginous matter. 
PALUDINA. (Lamarcx.) 
Lamarck described seven species of this genus, five of them being European. In the 
United States, the species are quite numerous. Mr. Say described thirteen, one of which 
(dissimilis,) properly belongs to his genus Anculosa, and three (limosa, porata and lustri- 
ca,) may be transferred to Dr. Gould’s genus Amnicola. Fifteen others have been proposed 
by myself and other naturalists, and I now add three to the number. 
PALUDINA REGULARIS. 
Testd subglobosd, subcrassd, virido-corned, levi, imperforatd; spird brevissimd; suturis impressis; anfractibus qui 
nis, convexis; aperturd magna, ovatd, intus ceruled. 
Shell subglobese, rather thick, greenish horn colour, imperforate; spire very short; sutures impressed; whorls five, con- 
vex; aperture large, ovate, within bluish. 
Hab. Ohio? T.G. Lea. My Cabinet, and Cabinet of T. G. Lea. Diam. .38, Length .52 of an inch. 
Remarks.—A very distinct species with the body whorl about four-fifths the length of 
the shell. ‘The whorls are very regular, giving the spire somewhat the appearance of a 
coil of rope. All the specimens before me are more or less incrusted with the oxide of iron. 
The aperture is inflated, and about three-fourths the length of the shell. 
Tam not positively sure that this species came from Ohio. By some accident the label 
has been misplaced, but I am under the impression it came with some other species from 
my brother at Cincinnati. 
PALUDINA OBTUSA. 
Testa subcylindraced, subtenui, tenebroso-viridi, levi, minute perforata; spird brevi, ad apicem valde obtusd; sutu- 
ris impressis; anfractibus quaternis, convewis; aperturd parvd, subrotundd, 
Shell subcylindrical, rather thin, dark green, smooth, slightly perforate; spire short, at the beaks very obtuse; sutures 
impressed; whorls four, convex; aperture small, nearly round. 
Hab. Ohio. Dr. Kirtland. My Cabinet, and Cabinet of Dr. Kirtland. Diam..07, Length .10 of an inch, 
Remarks.—This is among the smallest of the genus, and may at once be distinguished 
by its obtuse apex which has the appearance almost of being truncate. The whorls do 
not decrease regularly from the lower one to the apex, the greatest diameter being appa- 
rently across the second whorl. In form, therefore, it has the aspect of a Pupa. It an- 
Swers partly to the description of Paludina Alleghaniensis, (Green,) but seems to differ in 
the truncate appearance of the apex, andin the size. Two specimens were found in a box 
with some other small species, kindly sent to me by Dr. Kirtland. It is rather less than 
P. Nickliniana, and differs from it in being less tapering to the apex. It very closely re- 
Sembles P. viridis, (Lam.) but is rather larger and more obtuse. ‘There were no opercula 
to examine in these Specimens. Aperture rather more than one-third the length of the shell. 
VOL. IX.—7 
