92 THE OPEN BOOK OF NATURE 
yield remains of mammals akin to foxes and wolves, 
as well as of true opossums. Animals related to 
bats, hedgehogs, and squirrels lived in those times, 
and there were then some curious mammals which 
are now extinct. They were like elephants in 
respect of size, but they had the build of rhinoceroses ; 
their remains show that they had six strong horns 
arranged on their heads—a pair on the forehead, 
one on each cheek, and a pair on the snout. They 
Fic. 35.—PALMHOTHERIUM (RESTORED). 
An extinct mammal intermediate between the rhinoceros, the horse, 
and the tapir (Hocene). 
are called the Deinocerata (Greek, deinos = terrible, 
and keras=horn). Hornless deer existed in Hocene 
days. Mammal remains of now living species occur 
more and more frequently in the later Cainozoic 
deposits. Rhinoceroses, camels, bears, lions, stags, 
and wolves lived in Miocene times, and relics of 
antelopes, deer, giraffes, horses, gazelles, and oxen 
occur in the Pliocene strata. In the latter Age the 
Sabre-toothed Tiger played terrible havoc ; luckily 
