kn » 
"s Monograph of the Helices 
378 
prominent callus or obtuse tooth on the inner edge 
near the base; umbilicus rather large and profound, 
exhibiting all the volutions to the apex; base convex, ' 
with the strie convergi 
Greatest transverse 
eighth, à 
. GEoaRAPHICAL DisrRrBuTION. Inhabits the banks 
of the Ohio, Mississippi, and Missouri rivers; has 
been observed on the latter as high as Council Bluffs. 
Found also in the western parts of Pennsylvania and 
Virginia. : i 
Remarks. This is one of our most remarkable 
shells, by reason of its reddish-brown bands and 
lines. There is usually one band on the upper side 
of each whorl, wholly visible on the body-whorl and 
partially concealed on the spire; while on the lower 
part of the shell there are numerous fuscous lines. 
‘In ‘some instances, the broad band is deficient; 
others the lines, and occasionally the. rufous lea 
extends over the whole shell, leaving only one or 
two lighter lines. The superior and inferior ex- 
tremities of the lip approach each other at their 
_ junction with the body-whorl, leaving only a small 
ó into the umbilicus. —— 
ameter one inch.and one 
E 2 u^ 
space of the whorl between them, and rendering the 
‘aperture almost circular ; a thin whitish callus some- 
times completes the union. I tooth is ve 
in immature shells. 
— Mr. Say’s “ description of this shell was 1s published 
in the year 1821. Lamarck’s description of Hx 
“Richardi did not appear until April, 1822, but he 
‘quotes by anticipation Férussac, Hist. Nat. des Moll., 
Wo. 174; for the specific name, which, however, was 
