MORRISON MAMMALS: MULTITUBERCULATA ii 



Mammalia 



Eplacentalia 



Order Marsupialia 



Suborder Allotheria 

 Tritylodontidae 

 Plagiaulacidae 

 Polymastodontidae 

 Polydolopidae' 



In the course of the present and of related studies, all the pertinent materials 

 have been restudied at first hand. The results are given in large part in the present 

 memoir and completed in the various papers bearing on multituberculates given in the 

 appended bibliography under Simpson, and Granger and Simpson. On these results 

 is based the following synoptic classification of the multituberculates: 



CLASS MAMMALIA Linnaeus 1758 



SUBCLASS ALLOTHERIA Marsh 1880, emend. Simpson 1928* 

 ORDER MULTITUBERCULATA Cope 1884° 

 Suborder Tritvlodontoidea Simpson 1925 

 Family Tritylodontidae Cope 1884 

 Trkylodon Owen 1884 

 Oligokyphus Hennig 1921 

 Chalefotherium Simpson 1928 

 Stereognathus Charlesworth 1855 

 Inc. sed.: Archaeodon v. Huene 1925 

 Suborder Plagiaulacoidea Simpson 1925 

 Family Plagiaulacidae Gill 1872 

 Plagiaulax Falconer 1857 

 Bolodon Owen 1871 

 Ctenacodon Marsh 1879 

 Psalodon Simpson 1926 

 Loxauiax Simpson 1928 

 Family Ptilodontidae Simpson 1925 

 P Modus Cope 1 88 1 

 Neoflagiaulax Lemoine 1882 

 Z./otow«j Cope 1884 



' Although usually placed in the Multituberculata, the polydolopids surely do not belong here as 

 the writer has elsewhere attempted to prove (Simpson 1928E). A discussion of them is not necessary in 

 this work. 



* Proposed by Marsh as an order, afterward reduced by him to subordinal rank. Granger (1915) 

 suggested that the multituberculates "are probably entitled to rank as a distinct primary division [i.e., 

 subclass] of the Mammalia." The present writer proposes to retain the generally adopted term Multi- 

 tuberculata for the order and to use Allotheria for the subclass, a use for which its form is very apt. 



° Proposed as a suborder, afterward raised to ordinal rank. 



