. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 519 the skull the portion of a horn attached shows the burr about one-half an inch above the orbit. In skull specimen no. 21551 (figs. 125a, 125/;) the characters are near those of the fine specimen of Merycodus osborni, figured and described by In the Barstow species the brain case seems narrower, the orbits a little less prominent, and the antlers are situated a little farther forward on the orbit than in M. osborni. The frontoparietal suture in M. osborni is almost identica
. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 519 the skull the portion of a horn attached shows the burr about one-half an inch above the orbit. In skull specimen no. 21551 (figs. 125a, 125/;) the characters are near those of the fine specimen of Merycodus osborni, figured and described by In the Barstow species the brain case seems narrower, the orbits a little less prominent, and the antlers are situated a little farther forward on the orbit than in M. osborni. The frontoparietal suture in M. osborni is almost identical in position with a line connecting the posterior sides of the antler bases. In the Barstow species the suture bows far back of the antler bases. Figs. 125a and 1256. Merycodus, sp. Skull, no. 21551, X %. Fig. 125a, lateral view; fig. 125b, dorsal view. Barstow Miocene, Mohave Desert, California. The mandible of the Barstow form has approximately the dimen- sions of the forms figured by Cope34 and referred to M. necatus, and the dimensions of the inferior cheek-tooth series are also similar. The maxillary is known only by small fragments. The degree of hypsodonty of the molars is greater than in the Virgin Valley forms, so far as known, and much less than in the Pleistocene Capromeryx. M3 has a strong hypoconulid lobe, which in some cases (no. 21490, fig. 130) approaches the size of the second or hypoconid-entoconid segment of the tooth. No suggestion of divi- sion of the posterior lobe of M3 has been noted more than the presence of a faint concavity on the posteroexternal side of the third lobe (figs. 129, 130). The inferior premolars (figs. 128 and 131a) are moderately hypsodont. The postero-external fold is generally strongly marked almost to the base of the tooth. 33 Matthew, W. Bull. Am. Mus. Nat. Hist., vol. 20, p. 106, 1904. 34 Cope, E. D., U. S. Geog. Surv. West of 100th Meridian, vol. 4, p. 82, Please note that these images are extracted from scanned page i
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