. Bulletin of the Department of Geology. Geology. 330 University of California Puhlications in Geology [Vol. 12 PLIOHIPPUS FEANCESCANA MINOR, n. subsp. Folder 3, figure 3 Type.—Four closely associated upper cheek teeth, Univ. Calif. Coll. Vert. Pal. 23263, 23264, 23266, 23267 (folder 3, and figs. 39a-39b), representing( ?) Pi and Ml of the left side, P^ and Mi of right side, Univ. Calif, loc. 3236. Beferred viaterial.— To this species are referred an upper P-(?), no. 23275 (figs. 38a-38b; folder 3, fig. 4, loc. 3264; a lower tooth, no. 23274 (figs. 40a- 40b), loc. 3258; a small set of incisors
. Bulletin of the Department of Geology. Geology. 330 University of California Puhlications in Geology [Vol. 12 PLIOHIPPUS FEANCESCANA MINOR, n. subsp. Folder 3, figure 3 Type.—Four closely associated upper cheek teeth, Univ. Calif. Coll. Vert. Pal. 23263, 23264, 23266, 23267 (folder 3, and figs. 39a-39b), representing( ?) Pi and Ml of the left side, P^ and Mi of right side, Univ. Calif, loc. 3236. Beferred viaterial.— To this species are referred an upper P-(?), no. 23275 (figs. 38a-38b; folder 3, fig. 4, loc. 3264; a lower tooth, no. 23274 (figs. 40a- 40b), loc. 3258; a small set of incisors in a portion of a premaxillary, no. 23347 (figs. 41a-41b), loc. 3256. All in Univ. Calif. Coll. Vert. Pal., all Univ. Calif, localities. Characters.—The type is characterized by: (1) the relatively small size of the teeth and the marked lightness of the styles; (2) the very. 40a 40b Figs. 40a and 40&. PlioMppus francescana minor, n. subsp. Pj, no. 23274. Fig. 40a, occlusal view, X 1; fig. 40b, outer view, X %. San Timoteo beds, California. slight degree of anterior projection of the protocone, which is very slightly grooved on the inner surface in the premolars; (3) the con- striction of the postprotoconal valley of the molars; (4) the narrow and relatively simple bordered fossettes; (5) the small dimensions of the primitively formed, referred lower tooth; (6) the .small size of the referred premaxillary and incisors. Description.—The upper cheek teeth of the type specimen (see folder 3, figs. 3a-3e) are considerably worn, with resulting very short- crowned appearance (they are in about the condition of wear of the P. francescana, type and of the older Bautista series (see folder 3, fig. la; folder 2, fig. 3a-). They are noticeably small, and are only moderately heavily cemented. The mesostyle is deep and remarkably narrow. The protocone is thick and rounded, with moderate antero- posterior diameter; in the premolars the inferior border is very slightly indented; i
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