. Bulletin of the Department of Geology. Geology. 306 University of California Publications in Geology [Vol. 12 accessory plications, especially those of little to moderately worn teeth. The incisors are large and still deeply cupped (fig. 25) ; the strongly concave outer edge of each incisor overlaps the convex inner edge of the adjoining tooth. The loxcer dentition (figs. 19-24) is of a long and rather narrow- crowned type. The fold of the metaconid-metastylid column is broad, deep, and symmetrically V-shaped, becoming more open and asym- metrical in worn specimens through the simultaneous e
. Bulletin of the Department of Geology. Geology. 306 University of California Publications in Geology [Vol. 12 accessory plications, especially those of little to moderately worn teeth. The incisors are large and still deeply cupped (fig. 25) ; the strongly concave outer edge of each incisor overlaps the convex inner edge of the adjoining tooth. The loxcer dentition (figs. 19-24) is of a long and rather narrow- crowned type. The fold of the metaconid-metastylid column is broad, deep, and symmetrically V-shaped, becoming more open and asym- metrical in worn specimens through the simultaneous elongation of. Fig. 25. Equus bautistensis, n. sp. Premaxillary with incisor teeth, no. 23348, X Bautista beds, California. the metaconid. The inward folding between the protoconid and hypoconid is sharp, and deepens from the premolars to M,. In a worn series (fig. 19) the fold is slightly broader and rounder. In the molars the fold only meets the mouth of the metaconid-metastylid column {versus its much greater depth and breadth in old specimens of E. caballus). The inner wall of the hypoconid of is considerably crinkled, as in E. caballus. The outer faces of the protoconid and hypoconid are markedly flattened, especially in the premolars, perhaps even more so than in E. caballus. The anterior portion of the entoconid resembles that of E. caballus, and the inward extent of the parastylid is similar. The mandible is very broad (fig. 24), measuring mm. in depth in the region of P-. The inferior border is not concave as in E. caballus, nor does it show the deep concavity anterior to the angle of the jaw seen in E. occidentalis of Rancho La Brea. It resembles more closely the mandible of E. scotti.^- The premaxillary is expanded in the region of the incisors, and appears to be of rather elongated proportions, pointing to a propor- tionately long-snouted form. 12 Gidley, J. W. Bull. Am. Mus. Nat. Hist., vol. 13, p. 114, fig. 3, Please note that these images are extracte
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