SHUMARD AND SWALLOW—NEW FOSSILS. 203 
vat Seong more deeply impressed as it approaches the 
aperture; aperture large, rotundato-quadrate, its height usu- 
ally a little aeoten than the width, very oblique to t is 
of the shell; contracted below near the columella; Zip sharp, 
strengthened above at its juncture with the columella by the 
callosity of the latter; columellar lip thick, concave, callous, 
smooth; swrface marked with numerous very fine lines of 
r 
tures. som 
preserved, and the fossil presents a delicate vermilion hue. 
focayay ae ons.—Spiral angle from 120° to 130°; length from 
x to base of an average specimen, nag greatest width, .82; 
an =m gt .00; width of sam 
Loc.—Missouri State collection, Upper Coal 
Measures, at a cree of localities along the Missouri River 
and Hinkston Creek, Boone County. Maj. Hawn found it at 
various points in the valleys of Cotton-wood Creek and Ver- 
‘i s a 
are pleased - to re ree to dedicate this beautiful species 
to R. | B. Pre, Esq., of the Missouri Geol. Survey, to whose 
labors the State calleetion is indebted for a number of its 
‘ost in connate foss 
mu tto ol Saht tan ton, very 
ex, eee with Fogg six to Daiebe very prominent revoly= 
te; suture deeply impressed; , semi- 
r margin co contracted near the 
0.203; dia 
