656 



SCIENCE PROGRESS 



Arctocyonidce and Miacidce in which the carnassials, when 

 developed as such, are formed by pm . 4 and m . 1, as in modern 



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Carnivora (fig. 1). Second, an inadaptive modification, as repre- 

 sented typically by the Hycenodontidce and Oxycenidce, in which 



