1921] Prick: Faunas of Bautista Creek and San Timoteo CaTwn 399 



Characters. — The relatively large size, great transverse thickness, 

 and general Pliohippus form. The transversely expanded wings and 

 resulting bold appearance of the metaconid-metastylid column, and 

 the convexity of the outer edges of the protoconid and hypoconid. 



Description. — The teeth are of much heavier proportions than the 

 average of the former section. All of the specimens excepting no. 



144 145a 145b 



Figs. 142o to 147. ?Pliohippus edensis, subform B. Large lower cheek teeth, 

 occlusal views, X 1; inner views, X Figs. 142a, 142t>, molar, no. 23232. Fig. 

 143a, no. 23224; fig. 143b, no. 23296a; fig. 143c, no. 23294. Fig. 144, Pj, no. 23326. 

 Figs. 145a, 145c, premolar, no. 23212; fig. 145b, premolar, no. 23223. Figs. 146a, 

 and 146b, nos. 23285, 23295 (reversed). Fig. 147, Mj, no. 23288. Eden beds, 

 California. 



23212 (fig. 145a) are considerably worn. Certain of the more worn 

 specimens are somewhat approached in appearance and size by the 

 larger teeth of the preceding section and no more than a sexual differ- 

 ence may exist. This is suggested by the presence of a worn molar, 

 no. 23294 (fig. 143c) that below the point of greatest transverse thick- 

 ness is no larger than certain teeth of the preceding section. 



