PLATE IX. 



left 





right 

 2 



3 



OrangOlltan (five tubercles) 



left 



Rg.3 Kg.4 



Man (fire tubercles) 



left 



Hg.5. Hg-6. 



Man (four tubercles) 



1 



right 



1 



right 



FIRST LOWER MOLAR. 



