1921] Frick: Faunas of Bautista Creek and San Timoteo Cafion 385 



103d, e, f) illustrate moderately and excessively worn stages, showing 

 the following age characters: (1) the retention to a considerable degree 

 of the protoeone characters of the moderately worn state; and (2) the 

 usual transverse narrowness and accompanying constriction and 

 attenuation of the fossettes and styles; (3) the narrowing of the post- 

 protoconal valley and loss of accessory fold. 



110 



Figs. 106 to 110. Pliohippus osborni, subform A. Premolar and molar teeth. 

 Fig. 106, premolar, no. 24037, occlusal view, X 1, inner view, X % ; fig. 107, 

 referred molar, no. 23334, occlusal view, X 1; outer view, X %; fig. 108, referred 

 molar, no. 23336, occlusal view, X 1; fig. 109, referred molar, no. 23332, occlusal 

 view, X 1; fig. 110, referred molar, no. 23346, occlusal view, X 1. Eden beds, 

 California. 



PLIOHIPPUS OSBOKNI, subform A 



Type specimen. — A slightly worn tooth from the left side of the upper jaw, 

 Univ. Calif. Coll. Vert. Pal. no. 24037 (fig. 106), Univ. Calif, loc. 3269. 



Bef erred moteria^.— Premolar, no. 23334 (fig. 107), and nos. 23336, 23332, and 

 23346 (figs. 108, 109, 110); and M^, no. 23350 (figs. 105a-105&). All in Univ. 

 Calif. Coll. Vert. Pal.; all from same locality as the type. 



