CHAPTER XI 



HISTORY OF THE fAMBLYPODA AND fcONDYLARTHRA 



These are two orders of hoofed animals which long ago 

 vanished from the earth and no member of either is known to 

 have survived later than the Eocene epoch ; both were of great 

 antiquity, dating back to the Paleocene, perhaps even to the 

 Cretaceous. The last of the fAmblypoda are found in the 

 lowest Uinta or highest Bridger, but they were relatively 

 abundant in all the more ancient beds. The following table 

 gives the more important American forms : 



Order fAMBLYPODA. fShort-Footed Ungulates 

 Suborder f Taligrada 



I. fPERIPTYCHID.E. 



'fPeriptychus, Paleoc. 



II. fPANTOLAMBDIDiE. 



\ Pantolamhda, Paleoc. 



Suborder fPANTODONTA 



III. fCORYPHODONTID^. 



t Coryphodon, Wasatch and Wind River. 



Suborder fDiNOCERATA 



IV. fUlNTATHERIID^. 



^Bathyopsis, Wind River. \ElacJioceras, Bridger. \Uintatherium, 

 do. ^Eobasileus, do. 



As is shown in the table, the suborder fTaligrada is entirely 

 Paleocene in distribution, the fPantodonta are lower Eocene 

 and the fDinocerata chiefly middle Eocene, though persisting 

 into the upper. The fDinocerata were the most striking and 

 characteristic of Bridger mammals, and two or three phyla 

 of them may be distinguished, though for our purposes this 



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