Cope.] 



382 



[Oct. 7, 



are ihe direct ancestors of the Protolabidid;^, the camels, and the Escha- 

 tiidae. These relations may be expressed in the following table : 



H 



Ph 



Of Pantolestid^ but one genus is known. The premolars are all 

 simple in the upper jaw, except the fourth, which has one external and 

 one internal tubercle. 



The structure of the premolars in Anoplotherium is complex for so 

 primitive a type, and the third superior has an internal crest as well devel- 

 oped as in some of the Booidea. To the Anoplotheriid^ are referred, 

 besides Anoplotherium, Diplobune of Fraas and Dacrytherium, Mixto- 



