1921] Prick: Faunas of Bautista Creek and San Timoteo Canon 323 



23268 (folder 3, fig. 2), Univ. Calif, loc. 3248; a worn left lower cheek series, 

 complete except for M3, no. 23276 (figs. 36o-36b), Univ. Calif, loc. 3263; and two 

 separate teeth, Pj and Mi of the right side, nos. 23271, 23272 (fig. 37), Univ. 

 Calif, loc. 3262. Also certain limb elements (pi. 46) from various localities 

 (listed on page 327). All specimens in Univ. Calif. Coll. Vert. Pal. 



Characters. — PUohippus francescana is characterized by: (1) the 

 great size of the upper cheek tooth series with accompanying heaviness 

 of the parastyle and mesostyle; (2) the nearly cylindrical cross section 

 of the protocone of the P- and P- (the inner border being rounded and 



35b 



Figs. 3.5o and 35&. Pliohippvs francescana, n. sp. Molars from left side of 

 jaw found associated with series of type specimen (see folder 3, fig. 1), nos. 23261, 

 23261a, and 23262; a, occlusal view, X 1; b, lateral view, X San Timoteo 



beds, California. 



unindented, as seen in the worn series of the type specimen), and the 

 markedly slight anterior projection of the elongated protocones of 

 the molar portions of the series; (3) the simple outer margins of the 

 large fossettes and convexity of the adjacent borders of the paracones 

 and metacones; (4) the exceptional transverse thickness of the referred 

 worn lower cheek series; (5) the great development of the fold between 

 protoconid and hypoconid, and the depth and roundness of the external 

 face of the protoconid. 



Description. — The dentition (see folder 3, figs. 1 and 2; also text 

 figs. 35a and 35&) represents a form of exceptional size, with heavy 

 parastyle and mesostyle and strongly developed cementation. The 

 teeth of the type specimen are much worn (being of the same stage 



