3IO THE EVOLUTION OF MAN. 



Vin. Eighth Period : Skeleton of the Monotremata (Fig. 196, p. 148). 



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



oharaoteristics of Mammals. 



IX. Ninth Period : Skeleton of the MarsupiaUa (Fig. 197, p. 152). 



The coracoid bone of the shoulder.girdle becomes atrophied, and tba 

 remnant of it amalgamates with the shoulder-blade. 



X. Tenth Period : Skeleton of the Semi-apes (Fig. 199, p. 164). 



The poaoh-bones, which distinguish Monotremes and Marsupials, 

 disappear. 



.XI. Eleventh Period : Skeleton of the Anthropoid Apm 

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



The skeleton acquires the peculiar development shared by Man ex. 

 clusively with the Anthropoid Apes. 



