422 THE ANATOMY OF YEETEBRATED ANIMALS. 



chroi are not a distinct group, but result from the mixture of 

 Australioids and Xanthocliroi. 



Fossil remains of Men or implements of human manufac- 

 ture have hitherto been found only in late Tertiary (Quater- 

 nary) deposits, and in caves, mingled with the remains of ani- 

 mals which lived during the glacial epoch. 



