PROGANOSAURIA 



127 



great interest as settling many doubtful points in their structure, 

 but they were still more so from the fact that he found his species 

 so nearly like that from Africa that he placed it in the same genus. 



mmammmm 



■ ■ : 



1.9 



'.ms*a\ 



Fig. 60. — Mesosaurus; life restoration,' after McGregor, the posture of hind leg 

 slightly modified. 



Since the proganosaurs were purely fresh-water or terrestrial ani- 

 mals, one can only wonder how they crossed from Africa to America, 

 or, what is more probable, how they migrated from America to 



