" The great and important order of the Hoofed Quadrupeds ( Ungulata ) is represented in the Eocene by examples of both of its two principal sections—namely, those with an uneven number of toes (one or three) on the foot ( Perissodactyle Ungulates ), and those with an even number of toes (two or four) to each foot ( Artiodactyle Ungulates ).
— from The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science by Henry Alleyne Nicholson
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