1288 CLASS MAMMALIA. 



of the skull of the one known species is estimated at as much as 

 sixteen inches. 



Of Uncertain Ordinal Position. — Here may be conveniently noticed 

 some minute Mammals, mostly known by teeth or fragments of 

 jaws, from the Lowest Eocene of Rheims, of which it is difficult to 

 say whether they are Marsupial or Placental, although it is highly 

 probable that some of them belong to the former division. Among 

 these may be mentioned Trtcuspodon, with teeth resembling those 

 of Sfialacotherium ; the allied Orthaspidotherium and Pleuraspido- 

 therium ; and Procynictis, in which the true molars approximate to 

 those of Amblotherium . 



