Pi It down Man 
15 
Fig. 1 5. — Left side view of the skull and lower jaw of the young (A) and 
adult (B) Chimpanzee; nearly one-half nat. size. The young skull is 
shaped somewhat like that of Piltdown man, with no bony brow-ridges ; 
the adult skull resembles that of the later Neanderthal (Mousterian) man 
in the shape of the forehead and the massive bony brow-ridges. 
