CLASSIFICATION OP 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. Ohder tPROTODONTA. 



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



Anteaters. 

 II. Subclass EUTHERIA. Viviparous Mammals. 



A. Infbaclass DIDELPHIA. Pouched Mammals. 



1. Ordeb tTRICONODONTA. 



2. Ordeb MARSUPIALIA. 



o. SuBOBDBR Polyprotodonta. Opossimis, carnivorous and 

 insectivorous Marsupials. 



b. SuBOBDEB Diprotodonta. Herbivorous Marsupials; 



Kangaroos, etc. 



c. SuBOBDEB t Allotheria. 



B. Infbaclass MONODELPHIA. Placental Mammals. 

 A A. .CoHOBT UNGUICULATA. Clawed Mammals. 



1. Obdeb t TRITDBERCULATA. 



2. Obdeb INSECTIVORA. Insect-eating Mammals. 



o. SuBOBDEB Lipotyphla, e.g. Moles, Hedgehogs, Shrews, etc. 

 6. SuBOBDEB t Hyopsodonta. 



c. SuBOBDEB t ProgUres. 



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



3. Obdeb fTILLO DO NTIA. 



4. Obdeb DERMOPTERA. The Flying Lemur. 



5. Obdeb CHIROPTERA. Bats. 



6. Obdeb CARNIVORA. Beasts of Prey. 



a. SuBOBDEB t Creodonta. Primitive Flesh-eaters. 

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

 c. SuBOEDEB Pinnipedia. Marine Carnivores — Seals and 

 Walruses. 



7. Ordeb RODENTIA. Gnawing Mammals. 



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



