EXPLANATION OF PLATE V 
Models of Heads of Oligocene Titanotheres four phyla. 
Fig. 1. Megacerops (brachycephalic), short horned. 
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. Titanotherium (dolichocephalie), short horned. 
Fig. 3. Symborodon (mesaticephalie to brachycephalic), long horned. 
Fig. 4. Brontotherium (mesaticephalic to dolichocephalic), long horned. 
