No. 536] ADAPTATIONS OF THE PRIMATES 481 



the first adaptations of the primates and it probably took 

 some time to arrive at the degree of difference found in 

 the Wasatch of North America. 



The fruit-eating brachycephalic group includes Anap- 

 tomorphus of American Eocene, Necrolemur and Micro- 

 chcerus of the European Eocene, and Tarsius, now living 

 in southeast Asia. During the Eocene the climate was 

 progressively colder, becoming at least temperate by the 



end of the Eocene in the northern parts of America. 

 This climate acted to force southward all the primates 

 of the north and also several other groups, so that dur- 

 ing the Lower Eocene we have the whole primate group 

 pushing down, the Anaptomorphidse all over North 

 America, the Microchoeridae on to what there was of Eu- 

 rope and the ancestors of Tarsius* on to eastern Asia, 



Sarle, Amer. Nat., Vol. 31, pp. 569-575 and 680-689, 1897. 



