642 IM OLDIIRS, JAI (SA (GLDIBIN TICS 
development of three large horns, two of these, the largest, 
projected from the superior edges of the orbital rims, the others 
from the anterior part of the snout. One skull taken from the 
Laramie Cretaceous of Converse county Wyoming, was eight feet 
from the tip of the snout to the tip of the posterior edge of the 
skull, and weighed, with the matrix of sandstone, 3600 pounds. 
The teeth were set in a single row in the jaws and were provided 
with two roots, a rather peculiar condition in the reptiles. The 
teeth were transverse and presented broad grinding surfaces. The 
whole body was stout and elephantine in proportions ; the skin 
was undoubtedly furnished with small dermal ossifications spread 
through its surface. The tail waslong and heavy. The animal 
must have been, according to Marsh, twenty-five feet long and 
about ten high. 
Torosaurus from the same horizon as the last was smaller, 
but still quite large, as one skull measured five and a half feet 
across the top. The most remarkable thing about this form was 
the great posterior development of the capelike portion of 
the skull. It extended much farther back than in Agathaumus 
and was perforated by two large fontanelles in the posterior part. 
The whole plate is much thinner than in the other form. 
Claosaurus is from the same region as the preceding and 
bears about the same relation to those forms that Sceldosaurus 
does to Stegosaurus, that is, the general characters of the body 
are the same, but the peculiar specialization has disappeared. 
This animal developed the posterior limbs at the expense of the 
anterior ones, as organs of locomotion. Oddly enough the front 
feet did not assume the function of grasping organs as in the 
Theropoda, which assumed the bipedal form of locomotion, but 
retained the broad terminal phalanges that indicate the possession 
of hoofs on the front feet even after they had grown so short 
that they could not have reached the ground. The hind feet 
possessed three functional digits as in Agathaumus. The mid- 
dorsal series of vertebree was strengthened by the presence 
of many long ossified tendons that extended for some distance 
on each side of the neural spines. The limb bones were solid. 
