1913] 



Merriam : 



Horses of Bancho La Brea 



407 



anterior fold is generally absent in advanced stages of wear. 

 On an individual with M 3 just coming into function it is absent 

 or barely indicated on M 1 and M 2 , but is distinctly shown on 



Figs. 9 and 10. Eqiius occidentalis Leidy. Mandible with dentition, 

 no. 12269, X %. Eancho La Brea Beds, California. Fig. 9, lateral view; 

 fig. 10, superior view. 



Fig. 11. Equus occidentalis Leidy. Mandible with dentition, no. 

 21002, X V-y. Rancho La Brea Beds, California. 



the last two premolars. On the posterior fossette a posterior 

 indentation or fold is commonly present in young animals, but 



