414 



Reviews — Prof. Edward D. Cope. 



at various times referred to the groups Creodonta, Mesodonta, Insec- 

 tivora, Tillodonta and Tasniodonta, tribes which are now regarded 

 as suborders of the Bunotheria. The group is almost as varied as 

 the Marsupialia, and is regarded as a generalized type in which the 

 relationships are not all with the smooth-brained mammalian orders, 



Catopsalis pollux. 



Inner. 



Outer. 



a Eight ramus external. 



b Right ramus internal. 



c Superior view. 



cl Inferior view. 



e Potymastodcn taoensis, possibly 

 molar teeth of Catopsalis. 



Superior. 



Ptilodus medicevus. 



but quite as close with the Gyrencephala. The Creodonta are 

 thought to be the ancestors of Carnivora, while the Mesodonta are 

 probably ancestors of the Prosimia3, and the affinity between the 

 Prosimia? and the Carnivora is considered as established. The Taenio- 

 donta have Eodent-like inferior incisors, but also possess inferior 

 canines. Each molar has a simple conical fang, and the enamel 



