. Bulletin of the Department of Geology. Geology. 238 University of California Publications. [Geology summit. In P. cognatus it is completely separated by a deep groove extending to the base of the crown. ^ Measurements. Diameters of ?>/], anteropost. 22 mm., transv. 1/ mm. Diameters of dpu anteropost. mm., transv. mm. Diameters of dp„, anteropost. 24 mm., transv. 14 mm. Diameters of dpt, anteropost. 24 mm., transv. 15 mm. Length of milk-molar series, dp, to dp^ 71 mm. Depth of jaw at dplt 42 mm. MERYCHIPPUS ISONESUS (Cope). A right upper molar (no. 10670, Univ. Cal. Col. Vert. Pala
. Bulletin of the Department of Geology. Geology. 238 University of California Publications. [Geology summit. In P. cognatus it is completely separated by a deep groove extending to the base of the crown. ^ Measurements. Diameters of ?>/], anteropost. 22 mm., transv. 1/ mm. Diameters of dpu anteropost. mm., transv. mm. Diameters of dp„, anteropost. 24 mm., transv. 14 mm. Diameters of dpt, anteropost. 24 mm., transv. 15 mm. Length of milk-molar series, dp, to dp^ 71 mm. Depth of jaw at dplt 42 mm. MERYCHIPPUS ISONESUS (Cope). A right upper molar (no. 10670, Univ. Cal. Col. Vert. Palae.) agrees in size and general characters with the corresponding tooth in the type of M. isonesus, and may be referred provisionally to that species. Diameters of molar, anteropost. 18 mm., transv. 22 mm. MERrCHIPPUS, sp. indet. (1). Figs. 2 and 3. A second species of Merycltippus of an almost brachyodont type is represented by two upper premolars, p1 and p2, in a frag- ment of the maxillary bone (no. 10659. Univ. Calif. Col. 2 3 Figs. 2 and 3.—Mevychippus, sp. indet. (1), first and second upper pre- molars, no. 10659, natural size. Palae.) The p2 has about the size and proportions of the corre- sponding tooth in M. calimarius except that it is much lower crowned. It differs from the latter also in some other important respects. P1 is much larger than that of M. calimarius, which it exceeds by nearly one-half its anteroposterior diameter. It is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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