Fig. 8. Evolution of the grinding teeth in the Aceratheriinae. A, Aceratherium filhoH. 

 Type : Paris. Lower Oligocene. B, Aceratherium leinanense (reversed'). Paris. Upper 

 Oligocene. C, Aceratherium lemanense. Ulm, Munich. Upper Oligocene. Z*, Ace- 

 ratherium tetradactyitim. Paris, No. 2379. Middle Miocene. E^ Aceratherium incisi- 

 vum. Type : Darmstadt. Lower Pliocene. All contour.s, X i. 



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