576 University of California Publications in Geology [Vol. 11 



213 



Fig. 212. Merycochoerus? (Pronomotherium ?) calif ornicus?, n. sp. Upper 

 premolars, no. 23128, natural size. Kicardo Pliocene, Mohave Desert, California. 



Fig. 213. Merycochoerus? (P ronomotherium ? ) calif ornicus, n. sp. Upper 

 molars, occlusal view, natural size. Type specimen, no. 21351. Bicardo Pliocene, 

 Mohave Desert, California. 



molars do not differ greatly from those of Merycochoerus buwaldi of 

 the Barstow heds excepting in their larger size. 



The premolars of the type specimen are imperfect. On a specimen 

 (no. 23128) associated with the type the premolars are well preserved 

 and have approximately the same dimensions as those imperfectly 

 represented on the type specimen. It is presumed that no. 23128 

 represents the same form as the type though this cannot be proved 

 with the material available. 



All of the premolars in no. 23128 show external and internal 

 cingula. They are at least as hypsodont as in Merycochoerus pro- 

 prius, and were probably longer than in that form. In the state of 

 wear shown in the material available it is not evident that the pre- 

 molars were more hypsodont than in M. buwaldi of the Barstow. The 



