334 



University of California Publications in Geology 



[Vol. 8 



CONCLUSIONS 



The mylodont skull series from Rancho La Brea is considered to 

 represent Mylodon harlani Owen, a species common in the Pleistocene 

 of North America. 



The species Mylodon harlani exhibits an extensive range of varia- 

 tion in skull and dental characters. 



For the present it does not seem possible to separate from M. 

 harlani the Nebraska specimen described by Brown as Paramylodon 

 nebrascensis. The Paramylodon skull possibly belongs to a female 

 individual. 



No mylodont species clearly separable from M. harlani is known to 

 occur in the asphalt beds of Rancho La Brea. 



