| M. | |
| Length of crown | ·017 |
| Depth of fang | ·009 |
| Height of crown | ·011 |
Galeocerdo hartwellii, Cope.
Cret. Vert, p.. 244.
This species belongs to the group G. Egertonii, Ag., having the two edges subequal and symmetrical. A single tooth from Cement Gulch, Col.
CESTRACIONTIDÆ.
"Two dorsal fins, an anal; nasal and buccal cavities confluent. Teeth obtuse, several series being in function." (Günther.)
Ptychodus, Ag.
Poissons Fossiles, t. iii., p. 56.
Ptychodus Whippleyi, Marcou.