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BULLETTX 120, UNITED STATES NATIONAL, MUSEUM. 



arctica, and Antarctica has been united with New Zealand and Aus- 

 tralia. It is quite possible that there was connection between Aus- 

 tralasia and Patagonia via Antarctica in the late Cretaceous. 



It should also be noted that there is substantial agreement in the 

 main between Arldt (1907), Haug (1909-1911), and Schuchert 

 (1915?) in such few charts as they show for corresponding geologic 

 periods during Mesozoic and Cenozoic times, though the three 



