CLASSIFICATION OF THE MAMMALIA 59 



and limits of the orders themselves there is very general 

 agreement. 



In the following table only the major groups are included 

 and those which are extinct are marked with a dagger (f). 

 The scheme is almost identical with that given in Professor 

 Osborn's "Age of Mammals," the few points in which I should 

 prefer a somewhat different arrangement being waived in the 

 interests of uniformity and avoidance of confusion. A few 

 changes are, however, made in matters which I regard as too 

 important to ignore. 



I. Subclass PROTOTHERIA. Egg-laying Mammals. 



1. Order tPROTODONTA. 



2. Order MONOTREMATA, e.g. the Duck-billed Mole and Spiny 



Anteaters. 

 II. Subclass EUTHERIA. Viviparous Mammals. 



A. Infraclass DIDELPHIA. Pouched Mammals. 



1. Order tTRICONODONTA. 



2. Order MARSUPIALIA. 



a. Suborder Polyprotodonta. Opossums, carnivorous and 



insectivorous Marsupials. 

 h. Suborder Diprotodonta. Herbivorous Marsupials; 



Kangaroos, etc. 

 c. Suborder f AUotheria. 



B. Infraclass MOXODELPHIA. Placental Mammals. 

 AA. Cohort UNGUICULATA. Clawed Mammals. 



1. Order f TRITUBERCULATA. 



2. Order INSECTIVORA. Insect-eating Mammals. 



a. Suborder Lipotyphla, e.g. Moles, Hedgehogs, Shrews, etc. 

 h. Suborder f Hyopsodonta. 



c. Suborder f Proglires. 



d. Suborder Menotyphla, e.g. Tree and Jumping Shrews. 



3. Order f TILLODONTIA. 



4. Order DERMOPTERA. The Flying Lemur. 



5. Order CHIROPTERA. Bats. 



6. Order CARNIVORA. Beasts of Prey. 



a. Suborder f Creodonta. Primitive Flesh-eaters. 

 6. Suborder Fissipedia. Wolves, Bears, Weasels, Cats, etc. 

 c. Suborder Pinnipedia. Marine Carnivores — Seals and 

 Walruses. 



7. Order RODENTIA. Gna\ving Mammals. 



a. Suborder Duplicidentata, e.g. Hares, Rabbits, Pikas. 



