38 
five, carinate, or with an acute shoulder, which is almost concealed 
on the spire by the suture ; it becomes more obtuse and almost 
obsolete, or even impressed on the body whorl, but near the 
lab rum it is again very obvious ; the whole surface has slightly 
elevated, somewhat regular lines, forming grooves between them 
across the whorls, and there is an appearance of revolving lines 
on the body whorl, particularly beneath ; labrum entire, thick, a 
little reflected, obtusely a little more prominent towards the base, 
but not anofulated. 
All the specimens I have found are dead and bleached. They 
occur abundantly in the ragged and abrupt “ bluff,” half a mile 
below New Harmony, near the river bank, with many Helices that 
are commonly found in the Western States. They are much of 
the same size or even a little larger than the Helicina orhiculata, 
JVob., which species is destitute of carina or of prominent wrinkles 
or elevated lines, its labrum is reflected, but not thickened, with 
a distinct angle near its base. 
SucciNEA VERMETA. — Shell suboval, yellowish, very thin and 
fragile, somewhat diaphanous, with nearly three very oblique 
volutions ; whorls very much rounded, w;rinkled ; suture very 
profoundly impressed ; spire rather prominent and acute ; aperture 
ovate, the superior termination rounded. 
Inhabits margins of ponds near New Harmony. 
This species is remarkable for the very deep indentation of its 
suture, giving to the whorls of the spire the appearance of being 
almost separated from resting on each other ; and by this cha- 
racter it maybe readily distinguished from the other species of this 
country. It was found by Dr. Troost.' 
S. UNDULATA. — Shell suboval, pale yellowish, translucent, 
fragile ; volutions three and a half ; spire moderate, wrinkles 
obsolete, body whorl wrinkled, or rather slightly undulated ; 
columella narrowed, so as to exhibit the appearance of an interior 
umbilicus, when viewed with a lens from the base. 
Leno’th about one-half inch. Inhabits Mexico. 
O 
Very similar to S. ovalis, Nob., but the suture is not so deeply 
indented, and it has from one-half to three-fourths of a whorl 
more; the surface of the body whorl also is rather undulated than 
wrinkled. One of the individuals lived nearly twelve months in 
my cabinet, without any apparent sustenance. 
