286 



THE MAMMALIA. 



as far as can be judged from the often great paucity 

 of their remains. 



Only one point stands out in this attempt to 

 throw light upon the relationships between the 



Fia. 50. Skull of Tillotherium fodiens, from above. One-fourth 



nat. size. After Marsh. 



mammals of that early period ; the indrawing of 

 the Insectivora, of that type which has been pretty 

 faithfully preserved from the earliest traces of 



