EOCEJjE OROCODILIA. 
(53 
Crocodilus grypus, Cope. 
Plate XXX. 
Sj’stein. Cat. Vertebrata Eocene New Mexico, U. S. Geog. Survs. W. of 100th M., 1875, 
p. 32. 
Established on remains of two individuals, which are in a fragmentary 
state, including- portions from all parts of the skeleton. The teeth are of 
unequal sizes, and are round in section in the anterior half of the jaws; are 
conic and compressed at apex, curved, and with delicate opposed cutting- 
edges, which extend to the base of the crown. The middle of the length of 
the crown is delicately rugose-striate in young teeth. A large tooth occupies 
a position a little anterior to the lateral notch. In the lower jaw, a very large 
tooth occupies a position opposite the posterior extremity of the symphysis; 
the latter marking the middle of the alveolus. Three teeth of much smaller 
size follow posteriorly in close succession, and are followed by a fossa to 
receive the apex of a superior tooth. The ramus is wide at the symphysis. 
The extremity of the lower jaw supports a large tooth close to the symphysis, 
which is followed by one of half its diameter. A part of the posterior 
outer side of the ramus is deeply pitted. 
In the second specimen, a part of the frontal bone shows that part of 
the cranium to be deeply and rather irregularly pitted. The orbital border 
is wide and shallow, and the lateral olfactory ridges not -prominent. The 
inferior ridge of the frontal which bounds the face of contact of the alisphenoid 
has a somewhat different position from that which it holds in C. grypus and 
JD. sphenops. Here it extends anteriorly to a point in advance of the post¬ 
frontal bone; there it only reaches to opposite the anterior part of the same. 
Here it is stronger, and the excavation of the surface on the side next the 
postfrontal is deeper. There are three larger teeth on the median posterior 
part of the mandibular ramus, which is there rather slender, and but little 
rugose. Tlie premaxillary bone and tooth are as in the first specimen. 
Another series of fragments perhaps belonging to the same individual 
as the last, includes numerous vertebrae and other skeletal elements. A 
cervical vertebra has a prominent hypapophysis with long base, which is free 
from the parapophyses. There are rugose lines between the latter and the 
edge of the cup. The dorsals have a hypapophysis with short base, and 
have a prominent shoulder with smooth sui-face-bone. In the articular cups, 
