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The articulation between the upper surface of the astragalus and the tibia is
pulley-like and permits only fore-and-aft movement of the limb. Teeth. The full
complement of mammalian teeth consists of three incisors, one canine, four
The premolars were simple and the incisors reduced, but canines and molars
were enlarged. True rhinoceroses are probably also descended from early
hyracodonts. They became numerous in the Oligocene as large animals with
Skull advanced in structure; premolars much simpler than molars, molars of
simple lophodont form. Ten to 12 genera. ^Family Lophiodontidae (lophiodonts).
Lower to upper Eocene; Europe and probably Asia. Skull not tapir-like, lophs of ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review