3 IO THE EVOLUTION OF MAN. 



VIII. Eiylith P^iod: Skeleton of the Monotremata (Fig. 190, p. 148). 

 The vertebral colnmn, skull, jaws, and limbs, acquire the definite 

 characteristics of Mammals. 



IX. Ninth I'eriod : Skeleton of the Marsupialia (Fig. 197, p. 152). . 



The c'onicoid bono of the shonlder.girdle becomes atropliied, and the 

 remnant of it amalgamates with the shoulder-blade. 



X. Tenth Period : Skeleton of the Semi-ape* (Fig. 199, j>. 1R4^. 

 'I'he (c-uch-bones, which distinguish Monotremes and Marsni iala, 

 disappear. 



XI. Eleventh Period: Skeleton nfthe Anthropoid Apes 

 (Figs. 204-208, p. 179). 



The skeleton acquires the peculiar development shared by Man ex- 

 clusively with the Anthropoid Apes. 



