Note 167 — Chapter X · THE LARGE MILK-GIVERS WHICH HAVE CONQUERED THE WORLD BY STRENGTH AND INTELLIGENCE.
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The genealogy of the horse is so important, that it may be well to give a table of the seven principal stages, though transitions are known even between these.
Period. In America. Front Toes. Hind Toes. No. of Teeth. In Europe.
7. Recent and Upper Pliocene -- Equus 1 --------- 2 splints 1 --------- 2 splints 40 Equus. Equus.
6. Upper Pliocene Pliohippus 1 --------- 2 splints 1 --------- 2 splints 42 --
5. Lower Pliocene Protohippus 1 large -------- 2 small 1 large --------- 2 small 44 Hipparion.
4. Upper Miocene Miohippus 3 3 44 Anchitherium.
3. Lower Miocene Mesohippus 3 -------- 1 splint 3 44 --
2. Upper Eocene Orohippus 4 3 44 --
1. Lower Eocene Eohippus 4 -------- 1 splint 3 44 --