1921] Frich: Faunas of Bautista Creek and San Timoteo Canon 343 



the hinder two-thirds of the protocone from the backward-sweeping 

 deuterocone. A strong, forwardly directed fang supports the tritocone 

 and the posterior portion of the protocone ; a more massive, forwardly 

 directed root supports the anterior portion of the latter cone and the 

 adjoining 2:)rotostyle ; and a third, inner, and more slender fang 

 supports the deuterocone. 



51b 



Figs. 49a-49&, .50o-50&, 51a-51c. Myaenarctos gregoryi, n. sp. Upper teeth, 

 X 1. Figs. 49a, 496, P*, no. 2402.5, type, occlusal and outer views; figs. 50a, 5()h, 

 V-, no. 24027, referred, occlusal and outer views; figs. .51a-51e, M^, no. 24026, 

 referred, occlusal, outer, and anterior views. Eden beds, California. 



