£/ep/ias Yb 



RECENT 



PLEISTOCENE 



UPPER PLIOCENE}] 



Steoodon Yb 



Mastodon 78 



MDOLE M/OCENE \ 



North America 



Terrabelodon?^ MER MIOCENE) 

 ? UPPER OLIGOCENE 



LOWER PLIOCENE\Gomphorhenun 



UPPER MIOCENE ] ^'"'tlh 



MioroTion Mo 1 Gomphothent 



Ijonu chin). 



LOyPROL/GOCENE 



Pglaeomasrodon 'fy UPPER EOCENE 



MIOOLE EOCENE ] 



Palaeomastodon 



{le/io//ien/no ch'my. 



Moer> 



llherium 

 {short cfi in) 



Moerit/ienum /'/ 



? L Oh/PR POCPA/P (ancestor ur^hnov^n) . ? 



Fig. 229. — Evolution of the Proboscidea : on the right, a series of skulls; on the left, 



last lower molar. (After Lull, modified by Sinclair.) N.B. \T etrahelodon should 



read iGomphotherium. , ^_^ 



(43/) 



