1921] Fricl:: Faunas of Bautista Creel,- and San Timoteo Canon 351 



Hef erred speeimens. — Fragmentary lower series, including Pj to M5, and show- 

 ing the alveolus of P^, no. 23370 (iig. 59); a premolar, no. 23776 (fig. 60); a 

 worn upper cheek tooth, no. 23777 (fig. 61); a portion of a third lower molar, 

 no. 23775 (fig. 62); and a small incisor, no. 23788 (fig. 63). All Univ. Calif. Coll. 

 Vert. Pal.; all from Univ. Calif, loc. 3269. 



Generic and specific characters. — The low crowns and the tendency 

 of the patterns to be mnlticuspid. The small size and but partial 

 molariform character of the third premolar. 



58 



59 



a. 



a 



62 



Figs. 58 to 63. Prosthennops edensis, n. sp. Upper and lower teeth. Fig. 58, 

 type specimen, P- to M=, no. 23369, occlusal and lateral views, X 1. Referred 

 specimens: fig. 59, fragment of mandible with cheek tooth series, no. 23370, 

 X %; fig. 60, P5, no. 23776, lateral and occlusal view, X 1; fig. 61, upper molar, 

 no. 23777, occlusal view, X 1; fig. 62, fragment of M5, no. 23775, occlusal view, 

 X 1; fig. 63, incisor, no. 23788, X 1. Eden beds, California. 



Description. — The crowns of the teeth of the type specimen, fig. 58, 

 are well preserved. The two premolars are very little worn in com- 

 parison with the first molar. The second molar is much larger than 

 the first, and shows jjosteriorly an even greater development than in 

 M-. Anteriorly the teeth are bordered by cingula-like shelves, which 

 are most prominent in the premolars. The shallow transverse valleys 

 between the paired anterior and posterior cusps are continuous and 

 scarcely interrupted by conules that occur within the pairs, tending 

 to connect each in a primitive transverse crest. The inner edges of 

 the crests are somewhat produced. 



