iii Europe in as early a horizon as here. If our correlations of 

 horizons is correct, several problems are suggested, among which, 

 whether Europe and America were once a common land area, or did 

 the horse have a dual origin and thus gave rise to these similar 

 forms, or after all was there only one place of origin, and migration 

 took place at a date yet unknown? If only one, 

 United States or Europe,— is to be regarded as the home? 



then which, — the 



Figure 8. 



Among the large forms that attract the visitors at the Brea 

 Beds is that of an immense ox, Bos antiquus. The family to which 

 this species belongs is the Bovidae characterized by hollow horns, 

 hence what we find fossil are only the horn cores. Of the five speci- 

 mens found, one is particularly large and likely a mature male, 

 Figure 8, while the others are younger females, Figure 9b. The ox 



Figure 9. 



36 



b. 



