1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
EQUIDAE, the family of perissodactyle ungulate mammals typified by the horse (Equus caballus) ; see HORSE. According to the older classification this family was taken to include only the forms with tall-crowned teeth, more or less closely allied to the typical genus Equus. There is, however, such an almost complete graduation from the former to earlier and more primitive mammals with short-crowned cheek-teeth, at one time included in the family Lophiodontidae (see PERISSODACTYLA), that it has now become a very gene…
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- Vol. 9, pp. 720-722