EOCENE CROCODILIA. 
65 
the transverse impression preceded by a smooth space seen in that species. 
The pitting is, on the other hand, gradually reduced toward the nasal region. 
Other cranial bones are strongly sculptured. A portion of the maxillary 
contains teeth. These are robust, with slightly compressed, obtusely conic 
crowns, with rugulose enamel. 
A cervical vertebra is elongate, with the short hypapophysis free from 
the parapophyses; its ball is subcircular. 
Measurements. 
M. 
Length of the frontal bone (10 millimeters supplied)..... 0.130 
Length of the anterior production of the same. 0.053 
Width of the same at front of the orbits. 0.037 
Width of the same posteriorly to the inferior groove... 0.030 
Depth of the mandible at the cotylns... 0. 053 
Length of a cervical vertebra. ,... 0.043 
Width and depth of the ball of the same. 0. 025 
Length of a lumbar........ 0.043 
The size of this species was equal to that of the fully-grown Louisiana 
Alligator. 
This Crocodile is named in res^iectful recognition of the services to this 
department of natural science of Lieut. George M. Wheeler, directing the 
U. S. Geographical Explorations and Surveys west of the One hundredth 
Meridian. 
Crocodilus ? elliottii, Leidy. 
Plate xxxi, figs. 6-17. 
Report U. S. Geol. Survey Terrs., i, p. 125, pi. viii, figs. 4, G. 
With this species, we enter the second group of the genus above noted, 
where the frontal bone is stout, and furnished with prominent inferior ridges. 
The specimens referred provisionally to the C. elliottii embrace cranial bones 
and teeth, but I do not consider the reference final. 
The frontal bone is wide between the orbits, where six round pits can 
be counted in a somewhat irregular transverse line. The prefrontals extend 
backwards, and contract the frontal, so that between them only two pits can 
be counted. A fragment of the left premaxillary shows the muzzle to be 
flat, rather narrow, and strongly pitted. A tooth in a fragment of the jaw 
presents a short, obtuse, compressed crown, with finely striate enamel. 
5 G R 
