The Reign of Reptiles 



really is not so important a character as the 

 structure of the shoulder- and hip-bones and 

 that of the ankle-joint. In ourselves and other 

 mammals, as well as in existing reptiles, the 



Leg of emu and dinosaur, showing the resemblances between 

 the two. 



ankle-joint is between the bones of the ankle 

 and those of the lower portion of the leg, the 

 tibia and fibula. But in birds and in dinosaurs 

 some of the ankle-bones are united with the 

 leg-bones, so that the ankle-joint comes in the 



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