GREGORY: 



NOTHARCTUS, 



AN AMERICAN EOCENE PRIMATE 



241 



for opposable hallux; ilium becoming expanded for enlarged glutei, iliacus and abdominal muscles: an- 

 cestors of chimpanzee, gorilla, and man. Giving rise to: 



(lOA) Miocene to Recent. Forest-living subterrestrial anthropoids, with reduced thumb and 

 very short hind legs; finally becoming gigantic; chimpanzee, gorilla. 



(lOB) Miocene (?) to Recent, Primitively plains living, fully terrestrial erect types, with per- 

 fected thumb, widely expanded pelvis, long hind limbs; the pes readapted for terrestrial progression. 

 Entocuneiform facets flattened, hallux made parallel to other digits, which become much shorter while 

 the hallux grows longer, phalanges much abbreviated: Hominidse. 



