SHUMARD AND SWALLOW—NEW FOSSILS. 199 
ution, which permit us to recognize only the following char- 
acters: Depressed discoidal; umbilicus — allowing all the 
volutions to be seen; septa rather thin, numerous, sinuate 
on the sides and gently a arched ba ceiver on the dorsum; — 
sides flattened, rounded at the inner edge and obtusely sub- 
marked with three ranges of tolerably pro: rominent nodules, 
one of the ranges being central, the others situated on the 
exterior ed 
ges. 
Geol. she vet Loc.—Upper Coal Measures, Valley of Ver- 
digris and Kansas Rivers, near Pottawattamie Reservation. 
Collected by Maj. F. Hawn. 
Dae erga ae POLITUS, Shumard. 
— by extremely fine, revolying, closely arranged 
_ The ao ae nuh aa ie is not ‘visible. on ey y of 
re us. 
; aperture longer than wide, margins sinuate 
With a few, obscure, transverse ning wide 
towards | ¢ Other surface m 
Pig om: ‘a the : 
