48 
Specimens of this shell, brought from the Lakes and their vicin- 
ity, by Mr. Lesueur, had the revolving lines very obscnre or obso- 
lete. 
Lister’s lower figure of tab. 109 also resembles this shell. 
Paludina vivipara.* — Shell subconic, with six rounded 
whorls ; suture impressed, color olivaceous or pale, with three red- 
brown bands, of which the middle one is generally smallest ; whorls 
of the spire with but two, aperture suborbicular, more than half 
the length of the shell. Plate 2, fig. 3. 
Donov. Brit. Shells, tah. 87, Helix vivipara. 
Lister. Conch, tah. 126, 26; Cochlese vivipara fasciata. 
It is doubtful whether or not this is the same as the vivipara^ 
but it certainly approaches very near to it; we, however, refer it to 
that species until a specific difference can be indicated, which at 
present we are unable to do ; the spire of this species is rather 
more obtuse, and the suture not so deeply impressed, as in the figures 
of the European specimens above mentioned. 
Paludina dissimilis. — Shell conic, dark horn color or black- 
ish ; whorls about three, with obsolete, distant wrinkles, and an 
abrupt, acute, prominent carinated line, which revolves on the mid- 
dle of the body whorl, and is concealed on the spire by the suture; 
suture not indented, aperture oval, half as long as the shell, within 
sanguineous beneath the carina, and at base and apex ; columella 
eniarginated, a little flattened at the base. Length about two-fifths 
of an inch. 
Yar. a. Carina ^bsolete on the ventral portion of the body 
whorl, 
Yar. h. Carina distinct on the spiral whorls, owing to their more 
oblique revolution. 
The surface of the whorls of the spires is generally covered with 
inequal calcareous matter, resembling a fortuitous accumulation of 
mud or earth on that part, but which appears to be superposed by 
the animal, probably with the intention of retaining a proper specific 
gravity. The apex is often truncated. 
This species was found by Mr. Thomas Nuttall, during a journey 
to Pittsburg. 
*[In the earlier editions of Mch. Enc. this species was described under 
Ljmngea.-— Ed.] 
