Xvi ILLUSTRATIONS. 



Pagtt 



In.. 93, Skull of BrontotUerium ingens Marsh; side view 522 



94. Skull of Titanopa cut l us Marsh ; front view 522 



95. Testudo brontops Marsh ; top view 523 



m;. The same specimen ; bottom view r.23 



*iT. Skull of Entelodon olavus Marsh; with brain-oast, top view 523 



98. Skull of Eporeodon major Leidy ; seen from tin- left 524 



99. Limb hones and teeth of Fliohippns pernix Marsh. Pliocene 524 



100. The same series of Protohippus avus Marsh. Pliocene 524 



101. The same series of Mesohippns oeler Marsh. Miocene 524 



102. Skull of Accra! helium acutuui Marsh ; seen from the loft 525 



