64 
EOCENE CROCOBILIA. 
the transverse slightly exceeds the vertical diameter.- The caudals are of 
moderate length. The condyles of the femur are of unequal size, and the 
head not expanded. 
Measurements. 
No. i. M. 
■Widtli of the ramus at the symphysis. . . 0. 030 
Diameter of the large alveolus at the symphysis. 0.015 
Length of the bases of the four teeth following.. 0.029 
Diameter of the large premaxillary tooth ... 0.010 
Diameter of the anterior lower incisor .... 0.013 
Width of the ramus at the second incisor.. 0.031 
No. 2. 
Width of the frontal bone above the orbit to the inferior groove.. 0. 020 
Depth of the ramus behind, middle... 0.032 
Length of the cervical vertebra. 0. 038 
Width at the articular ball ... 0.025 
Length of a dorsal... 0.037 
Width at the articular cup. 0.025 
Length of a caudal.. 0. 043 
In comparison with a common large species of the Bridger formation 
from Wyoming, which agrees with such characters as can be found in the 
description of C. affinis, Marsh, I find the position of the large mandibular 
tooth is quite different, it being considerably anterior in the Wyoming 
species. The first incisor tooth is also less enlarged in the latter. 
Crocodilus wheelerii, Cope- 
Plate xxxi, figs. 1-5. 
Syst. Cat. Vertebrata Eocene New Mexico, U. S. Geog. Survs. W. of 100th M., 1875, p.33. 
This Crocodile is known from remains in the same fragmentary condi¬ 
tion as those already described. There are numerous portions of the 
cranium with vertebrae. 
This species is at once distinguished by the relative width of the inter- 
orbital portion of the frontal bone, and the slight development of the 
lateral inferior ridges. The pitting is relatively smaller than in any of the 
other species, numbering five or six rows on the parietal region. There is 
a smooth border of the superciliary edge. The frontal has a narrow anterior 
prolongation between the prefrontals, longer than in “(7. and without 
