310 ORIGIN AND DISTRIBUTION OF MAMMALS 



a part of Europe. Lastly, so far as Australia is concerned, its mammal fauna 

 seems to have immigrated comparatively recently, certainly not before the 

 Tertiary. The theory of an Antarctic continent, which would be at the same 

 time the home of certain mammalian types, such as the Notoungulata and 

 Suhungulata, receives no support from the geological history of the mammals. 



