THE MARSUPIALS, OE POUCHED ANIMALS. 101 



Lemoine also finds agreements between Plagiaulax 

 and Microlestes, and has thus lengthened the series 

 from the Present to the Trias formation. The 

 French zoologist further discovers in the upper 

 cheek-teeth of the Brown Eat similarities with 

 teeth which, found isolated, probably belong to 



Fio. 3. 



A. Lower Jaw of Neoplagiaulax. 



B. Lower Jaw of Bettongia penicillata. After Lemoine. 



Plagiaulax. All this points to the primeval stock 

 where Marsupials, Insectivora, and Eodents meet. 

 But we cannot imagine that Plac/iaulax was an 

 insect-eater ; I should be inclined rather to assume 

 that Bettongia lived upon vegetable food. 



The scientific dispute regarding the mode of 



