1921] Frick: Faunas of Bautista Creek and San Timoteo Canon 393 



Lower Cheek Teeth Tentatively Referred to Pliohippus 

 osborni, n. sp. 



Material. — An abnormally large tooth from the right side of the jaw, no. 

 23222 (fig. 127); and very tentatively placed with the same, a large molar, 

 no. 23197 (fig. 128). Both specimens in Univ. Calif. Coll. Vert. Pal., Univ. Calif, 

 loe. 3269. 



Description. — The large lower tooth (no. 23222, fig. 127) is very 

 Equus-\\\^Q. especially in the flatness of the inner walls of the proto- 



Figs. 127 to 129. ?PUohippus osbomi, n. sp. Premolar teeth, outer and 

 occlusal views, X 1. Fig. 127, no. 23222; fig. 128, no. 23197; fig. 129, PUoMppus 

 osborni, n. p., upper premolar of type specimen, no. 23787, inner view, X 1. Eden 

 beds, California. 



eonid and hypoconid. The relative anteroposterior length of the 

 crown, the transverse narrowness of the anterior end, and the depth 

 of the fold between the protoconid and hypoconid point to the 

 specimen representing the last premolar. The groove, or gutter, of 

 the metaconid-metastylid column, unlike Equus, is sharp and deep; 

 the wings of the metaconid and metastylid are broadly expanded and 

 unsymmetrical, that of the metaconid being especially enlarged and 

 produced forward and inward. The exterior faces of the protoconid 



