South Dakota School of Mines 



Bulletin Xo. 13. Plate No. 24. 



A. Skeleton of the Upper Miocene three toed horse Neohijiparion ivhitneyi. 

 Osborn. Copyrighted by the American Museum of Natural History. 

 Reprinted by permission. 



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B. Skeleton of the primitive antiodactyl Merycoidodon (Oreodon) cul- 

 ttertsoni of the Oligocene. Osborn. Copyrighted by the American 

 Museum of Natural History. Reprinted by permission. 



