The Perissodactyla, 1075 
: 7 Equus to those of Hippotheriinz.t Subsequently Scott 
pointed out the relation which the genus Mesohippus (Marsh) 
bears to the series. Schlosser followed, throwing the Chali- 
l cotheriid and Menodontid genera out of the line into which they 
had been brought by Cope. In the present work the only change 
the author has made in his views is to return to his inclusion of 
"the Menodontidz in the line. 
_ Asa result the following genealogy of the species of horse 
maybe regarded as resting on the best evidence now available, 
ê regards genera. It will be long before the line of species 
which has propagated itself to the present day, and appears in 
the Equus caballus, will be discovered. 
- Equus sp, uus Sp. 
| Hippidium. 
Protohippus. Hippotherium 
) aie Anchippus. 
Mesohippus. 
Palezotherium. Paloplotherium. 
x 
? Epihippus. 
x 
Pliolophus. 
Systemodon. 
Genus of Amblypoda Hyodonta (unknown). 
PL 
An unknown genus of Periptychide. 
1. 
“ogg 1883, p. 705. 2 Morphologisches Jahrbuch, xii., 1886, p- 3 
ss 
os. Soc. Proceedings, 1881, p. 380; American Naturalist, I P 
