Piltdown Man 
Like the molar teeth this canine is also much worn by mastication^ 
and the surface of wear could only have been produced by an 
opposing tooth which interlocked so far as the level of the gum. 
F IG< 9. — Upper view of lower jaw of Piltdown man (B), compared with that 
of Chimpanzee (A), Heidelberg man (C), and modern man (D) ; one-half 
nat. size. c. = canine tooth ; m.l = first molar tooth. 
