Measurements.
| M. | |
| Antero-posterior diameter of ilium | ·095 |
| Vertical diameter of ilium | ·061 |
| Antero-posterior diameter of acetabulum | ·029 |
| Length of centrum of third (?) cervical vertebra (from edge of cup to tip of ball) | ·032 |
| Height of neural canal, third (?) cervical | ·0095 |
| Length of hypapophysis of third cervical | ·0085 |
| Length of centrum of a posterior dorsal | ·040 |
| Length of diapophysis (about) | ·032 |
| Length of centrum of a lumbar | ·046 |
| Vertical diameter of a lumbar | ·029 |
| Breadth of neurapophysis of a lumbar | ·027 |
Crocodilus heterodon, Cope.
Alligator heterodon, Proc. American Philosophical Society, 1872, p. 544.
Represented by a single tooth from the posterior part of the mandibular series. It agrees very closely with the corresponding tooth of Alligator mississippiensis, but presents some differences. The crown is very low, obtuse, and finely striate; it is compressed and shows a cutting-edge. Its longest diameter is fore-and-aft; both this and the transverse diameter are proportionately greater than in the modern species. The constriction of the neck is very decided; the fang is large, and especially thick.
Measurements.
| M. | |
| Fore-and-aft diameter of crown | ·010 |
| Transverse diameter of crown | ·007 |
| Vertical height of crown |
Crocodilus clavis, Cope.
U. S. Geol. Survey of Terrs. 1872, p. 612.