RHINOCEROS 103 
the three-toed stage the two lateral toes have lost their original function 
of support and are gradually becoming vestiges. The three-toed horse in 
the center of the alcove is one of the most complete and finest examples 
that has ever been unearthed. 
Opposite the horse exhibit on the other side of the hall are series of 
specimens illustrating the evolution of the camel, deer and other cloven- 
hoofed animals. These animals like the cow of to-day walked on the 
tips of the third and fourth fingers, and the gradual disappearance or 
reduction to useless vestiges of the other fingers and toes can be traced 
as in the horse series. 
The large blocks showing groups of skeletons of early camels, 
Camels skulls and bones of primitive ruminants in their natural 
position in the rock, show how these specimens are sometimes 
Giant Pigs found and raise questions as to how they got there, more 
and Pigmy easily asked than answered. The giant pigs, or elotheres, 
Hippopotamus and the pigmy hippopotamus will repay examination. 
The primitive rhinoceros-like animals are shown near the center of 
the hall on the right. As here indicated great herds roamed 
over the fields in the Tertiary Period and their fossil 
remains are found imbedded in the sandstones and clays of the badland 
formations. Opposite these are shown the ancestors of the dogs, cats 
and other carnivores and the Creodonts or Primitive Carnivores of the 
early Tertiary. Next to these are the small mammals—the insectivores, 
rodents and marsupials; and the fossil lemurs and monkeys, fragmentary 
but interesting because of their bearing on the ancestry of man. 
On the south side on the right are skeletons of titanotheres, on the left 
of uintatheres, huge extinct, horned animals peculiar to North America. 
Rhinoceros 
A.M. No. S116 
SKULL OF TRICERATOPS 
A huge, two-horned Dinosaur suggesting a Rhinoceros 
