G6 
EOCEl^E CEOCODILIA. 
Length of the frontal between prefrontal and parietal sutures. 0.041 
Width of the same between the orbits. 0.032 
Width of the same between the postfrontals.... 0.037 
Thickness of the same between the prefrontals .. 0.013 
Thickness of the same between the postfrontals. 0.011 
Elevation of the crown of the tooth..... 0.010 
Long diameter of the crown of the tooth... 0.010 
Numerous bones of tlie skeleton of another smaller specimen were 
obtained, the proper reference of which is uncertain, as it does not contain 
the portions which define the species as above described. Thus the sujDerior 
cranial bones and the terminal portions of the jaws are wanting. The pos¬ 
terior parts of the jaws show that at least four of the mandibular teeth pos¬ 
sess the very short and oval crowns seen in the Alligator mississippiensis and 
Crocodilus heterodon. As in these, they are divided by a low, longitudinal 
edge, from which fine grooves diverge on each side. The crowns become 
more acute anteriorly. One of the large teeth has the short obtuse crown 
characteristic of C. elliottii^ and quite different from those of C. grypus. The 
quadrate bone has a characteristic form. It is not so thin as in the C. 
tvlieelerii^ and lacks the ala of the inner side seen in C. cJiamensis. It differs 
from that of the sj)ecies here referred to C. fUodon in having the condyle all 
in one line, and not presenting an upward direction of the inner extremity. 
The pneumatic foramen is distinct. The centra of the dorsal vertebras pre¬ 
served are moderately depressed. 
Meast(rements. 
M. 
Extent iiicliule'd by last four mandibular teeth.. 0.040 
Length of the crown of the penultimate of the same.... 0.009 
Height of the crown of the penultimate of the same. 0.005 
Length of the condyle of the quadrate bone. 0.040 
Depth of the quadrate bone at the middle of the condyle. 0.012 
Length of a cervical vertebra. 0.035 
Length of a dorsal vertebra.... 0.030 
Depth of the cup of the same....... 0.017 
Width of the cup of the same. 0. 018 
Width of the centrum, including diapophyses. 0.034 
The dermal scuta are articulated, and with coarse pits. Several of 
them have a median thickening which represents a keel. 
