NEW FRESH WATER AND LAND SHELLS. Q] 
ANCULOSA TUBERCULATA. 
Testa ovatd, crassa, superne, tuberculatd, fuscd; spird brevi; suturis via impressis; anfractibus subconvevis; aperturd 
ovatd, intus carned; columella crassd, maculata. 
Shell ovate, thick, above tuberculate, brown; spire short; sutures scarcely impressed; whorls slightly convex; aperture 
ovate, within flesh-coloured; columella thick and spotted. 
Hab. Warrior River, Alabama. Dr. Brumby. Cabinet of Dr. Griffith. Diam. .38, Length .50 of 
an inch, 
Remarks.—The above description is made from a single specimen, which is truncate at 
the apex, as the species of this genus usually are. ‘Three whorls are visible. In a per- 
fect state, it probably has four. The specimen before me has two rows of tubercles. On 
the superior part of the whorl, and below these, are two parallel indistinct lines, which 
may, in other individuals, rise into tubercles. In the interior, two purple bands are visi- 
ble. On the middle of the columella there is a large purple spot. This may not occur 
in all specimens. The aperture is about two-thirds the length of the shell. 
VALVATA BICARINATA. 
Testa orbiculari, superné planulatd, bicarinatd, subcrassd, superne corned, inferne albidd, lat? wmbilicatd; suturis 
impressis; spird depressd; anfractibus quaternis, convewis ; aperturd rotundd, intus albidd. 
Shell orbicular, flattened above, bicarinate, rather thick, horn-coloured above, whitish below, widely umbilicate; sutures 
impressed; spire depressed; whorls four, convex ; aperture rounded, whitish within. 
Animal.—Body rather short and white, head large, tapering, slightly enlarged at the an- 
terior termination, with a black mark passing from the neck between the eyes, tapering 
off and reaching nearly to the end of the snout, where there are two oblique black marks 
bordered in front by white, and accompanied behind by several irregular white spots, the 
anterior ones being the larger. Branchia translucent, superior portion blackish, bordered 
with white spots and occasionally obtruded; eyes round and deep black, placed at the 
posterior base of the tentacula, surrounded by a white area; tentacula long, rather taper- 
ing, obtuse at the end; filament rather short, translucent with longitudinal white lines; foot 
wide and furcate anteriorly, where minute white spots may be observed. Operculum thin, 
semitransparent, light horn colour, increment circular and rather coarse. 
Hab, Schuylkill River, west side, below Permanent Bridge. H.C. Lea. My Cabinet. Diam. .30, 
Length .12 of an inch. 
Remarks.—In the form of the shell, this species closely resembles the ¢ricarinata, 
(Say.) It differs in having but two carinw, in having a wider umbilicus, and the spire is 
more depressed. ‘Ihe animals of the two species differ in form and colour more than the 
shells. 
The head of the ¢ricar¢nata is more cylindrical and enlarged at the termination, where 
it somewhat resembles the snout of the hog, while that of the décarinata is more conical 
and without so sudden an enlargement at the end, The colour of the dicarinata is lighter. 
In the black markings they also differ. In the ¢ricarinata there is a single blotch ante- 
rior to the area between the eyes. In the dicarinata this extends also behind this area; 
and in addition may be observed two quite black marks above the mouth, which the ¢rzca- 
rinata does not seem to have. The tentacula of the dicarinata are larger and more filiform. 
When in motion, the anterior portions of the lobes of the foot are pointed, and recurved or 
hooked. 
VOL. y=. 
