590 TRANS. OF THE ACAD. OF SCIENCE. 
taceous Period. That these beds, under notice, are equiva- 
the Pyramid 
will, I think, scarcely admit of a doubt; and it appears to 
me somewhat probable that a closer examination of the 
region around Pyramid Mount than Prof. Marcou was able 
to make, would result in the discovery there of the same fos- 
sils that Dr. G. G. Shumard has found in Grayson County. 
Descriptions of New Cretacrous Fossis from Texas.* 
By B. F. Saumarp, M.D., State Geologist. 
CEPHALAPODA. 
GENUS NAUTILUS. 
N. TExanus, n. sp. 
Shell large, last volution expanding rapidly towards the 
aperture; sides gently convex; dorsum strongly rounded ; 
siphuncle sfhungad between the center and ventral margin; 
sept flexuous, aperture semielliptical, height greater than 
the width, broadest posteriorly, and deeply excavated by the 
preceding volution; surface ornamented with numerous flex- 
uous, flattened convex ribs, which arise from the umbilicus, 
are arched forwards on the sides, and form a broad an 
rather deep sinus on the dorsum. ; . 
Although fragments of this species have been found at 
number of localities in Texas, we have not been so fortunate 
as to procure an entire specimen. | 
The WV. Texanus resembles somewhat closely the se 
pseudo-elegans of D’Orbigny, from which it may be disti ; 
guished by the form of the aperture, which is more elong# 
ted in our shell. ai tall 
ocality.—Oceurs in the Washita Limestone, associa”, 
with Epiaster elegans and Ostrea subovata, near Austin a2 
Bluffs of Red River, in Grayson County. ‘dell 
Collected by B. F. and G. G. Shumard and W. P. Ridde®. 
pr eos inert Maetaenia ores autem te 
l- 
