Fig. 491. (a) Teeth of Equus caballus pumpellii. Right part of upper maxilla.
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Teeth of Ass, from the Mummy from Abadieh, Egypt.
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Teeth of Horse, Pile-dwelling of Auvernier (Bronze Age).
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Teeth of Equus przewalskii.
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Teeth of Tscherski's Siberian Horse.
The form of the enamel of the teeth deserves further consideration, but since in horses the enamel is more wavy in younger than in older animals, while in the ass the reverse is the case, only specimens of similar age must be compared. Frank asserts that in the Oriental horse the enamel plication is less than in the Occidental. The most marked enamel plication of the interior borders of the anterior islands is shown in the diluvial horses; among these especially in the horses of Westeregeln and Thiede. The horse of Remagen has also slighter rippling, and I find it still less in the horse of Kesslerloch and Solutré. The plication
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