Permian ' 



Cotylosauria 



TKeroce^Ualia 



Anovnodontia 



Cyvvodontiai 

 DvovnatKeriuvn \, 



Cretaceous 



TritMberculata 



Uvidisco-uered 



Plaoe^tals. 

 Tub i*U d e nt at a ?- 



^\M^°^' PawioU-b^ 



""~ Monotrevnata 

 DijJvotodontia 

 Poly|)rotodontia 



TXenavtKva 

 Rodevitia 



DevyM,o|)teva 

 M eg'acUivo|)tera 



MicrocKivof). 



Fig. 31. Genetic relations of the orders, suborders and principal families of mammals 

 according to the author's interpretation of the evidence adduced in this work. 



(467) 



