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As compared with their early Tertiary representatives' some of our modern mammals have increased seven or eight-fold in brain-capacity. While the horses and tapirs and rhinoceroses were being gradually evolved from the primitive types, the Artiodactyl branch of the Ungulates the pigs, deer, oxen, etc. were also developing. We must dismiss them briefly.
We saw that the primitive herbivores divided early in the Eocene into the "odd-toed" and "even-toed" varieties; the name refers, it will be remembered, not to the number of toes, but to the axis of stress. The Artiodactyl group must have quickly branched in turn, as we find very primitive hogs and camels before the end of the Eocene.
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