PLATE IX. 



All figures three-fourths natural size. 



Aphelops fossiger. 



First upper left molar. 



Fourth upper left premolar, unworn. 



Fourth upper left premolar. 



Upper incisor. 



Third upper right milk molar. 



Second upper left molar. 



Second upper left molar. 



Second upper right molar, unworn. 



Second upper left milk molar, little worn. 



Second upper right milk molar, much worn. 



Third upper left milk molar, little worn. 



Third upper left milk molar. 



Third upper left molar. 



Third upper left molar. 



Second upper left molar, abnormal. 



Fourth upper left milk molar. 



Third upper left premolar. 



