240 THE WORLD OF LIFE CHAP. 



numbers of extinct forms, some of gigantic size, but all 

 undoubtedly allied to those living in Australia to-day. 

 Thus, bones of kangaroos are found ranging in size from 

 that of the smallest living species up to that of a donkey, 

 and sometimes of very distinct forms and proportions. But 



FIG. 92. SKULL OF AN EXTINCT MARSUPIAL, DIPROTODON AUSTRALIS. 



From the Pleistocene of Queensland and South Australia. With a man's skull, to 



show comparative size. (B.M. Guide.) 



with these have been found a huge wombat, the size of a large 

 rhinoceros, of which the skull is here represented (Fig. 92). 

 The complete skeleton has been quite recently obtained from 

 Lake Callabonna in South Australia. It is found to be 12 feet 

 long measured along the vertebrae, and 6 feet 2^ inches high. 



FIG. 93. SKULL OF THYLACOLEO CARNIFEX. 

 From the Pleistocene of Australia. One-fifth nat. size. (B.M. Guide.) 



