SHUMARD—CRETACEOUS FOSSILS. 595 
racing, leaving a deep umbili- 
cus in which three or four coils are visible; surface marked 
is a smaller and porportionally a more slender species, and 
GENUS ANCYLOCERAS. 
A. ANNULATUS, 0. sp. 
sect 
us prominent, obli impl hich are strongest on 
que, simple rings, which are stronges® 
the dorsal half of the yolution. Hach annulation is provided 
Th 
wo volution in the collection is a little more than the third 
of an inch. 
ite y hey Creek, Grayson County, in nodules of clay iron 
the T embedded in the indurated marly clay near the base of 
c Ower Cretaceous strata. 
ollected by Dr. G. G. Shumard. 
