.. SHUMARD—CRETACEOUS FOSSILS. 603 
Length, 0.74 inches; width, 0.54; thickness, 0.37; apicial 
angle 109°. 
Of this fine species we have found but one specimen, which 
is somewhat worn, although the surface markings are tolera- 
bly well preserved. 
Locality——Red River, Fannin County. In Septaria of 
Lower Cretaceous Group. 
Dedicated to Dr. F, V. Hayden, the well-known scientific 
explorer of the Upper Missouri Country. Collected by Dr. 
. G. Shumard, 
N. SERRATA, N. Sp. 
Form.and Locality.—In septaria of the marly clay, near 
the base of the Lower Cretaceous group. Bluffs of Red 
River, Lamar County. Collected by Dr. G. G. Shumard. 
GENUS CORBULA. 
nearest the anterior margin; surface marked with fine, dis- 
Unet concentric strive of growth. 
ngth, 0.54; width, 0.40; thickness, 0.24. : 
Fag Species is more compressed than any species known 
Formation and Locality.—In hard, fine-grained sand- 
Stone (Lower Cretaceous) Sates with fea bellarugo- 
“7 and O.congesta. Post-oak Creek, near Sherman, Gray- 
Sou County. ‘Collected by Dr. G. G, Shumard. 
