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The Zeuglodons from Eocene down to Pliocene, the Dolphins in the Pliocene, and the Ziphoids Catodontidae, and Balaenidae in the Pliocene, are all fully developed forms, with no intermediate species. Eohippus Lower Eocene of America; fore-feet have four toes and a rudimentary thumb or pollex. 2. Anchitherium Eocene and Lower Miocene; three toes, but 2 and 4 are diminutive. 4.
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