PROTOREODON 
(After Wortman.) 
yl 
xs 
Fia. 178.—Skeleton of Agriochoerus latifrons. 
CHAP. 
young. There are 
several species. Agii- 
ochoerus, like Oreodon 
and primitive Ungu- 
lates in general, had a 
long tail. The genus 
thus shows a mixture 
of ancient and special- 
ised characters. 
The most ancient 
form of Oreodont is 
Protoreodon. This is 
Eocene, and became 
extinet during that 
period. It had a com- 
plete dentition, open 
orbit, and no lachry- 
mal fossa. The fore- 
feet were five-toed, 
the hind four-toed. 
Fam. Anoplo- 
theriidae. — This 
family is entirely 
Eocene in point ‘of 
time, and is unknown 
outside Europe. The 
dentition of the 
eroup is complete ; 
the molars are seleno- 
bunodont, like those 
of the Anthraco- 
theriidae. The bones 
of the carpus, tarsus, 
metacarpus and meta- 
tarsus are all free; 
the toes are four to 
two in number on 
each foot. The orbit 
is widely open behind. 
The tail is long, as in 
Xiphodon, ete. 
t 
