Sk 
PE 
9 
. À 
ns 
.h 
EXPLANATION OF PLATE IV 
ulls representing four phyla of Oligocene Titanotheres. 
. Megacerops, probable successor of Manteoceras (brachycephalic). 
. Titanotherium, probable successor of Telmatotherium (dolichocephalie). 
. Symborodon (brachycephalic). 
. Brontotherium (dolichocephalic to mesaticephalic). 
