. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 473 and This species seems very near II. affinis, but is possibly to be referred to H. nevadensis from an adjacent area. Were it not that the milk dentition of both H. affinis and H. nevadensis are known, it would be difficult to find means of separating the Nevada species from H. 28 Fig. 28. Hypohippus, near affinis Leidy. Mt and M2, no. 21215, natural size. Barstow Miocene, Mohave Desert, California. A fragmentary upper molar, no. 21214, shows no characters more tha
. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 473 and This species seems very near II. affinis, but is possibly to be referred to H. nevadensis from an adjacent area. Were it not that the milk dentition of both H. affinis and H. nevadensis are known, it would be difficult to find means of separating the Nevada species from H. 28 Fig. 28. Hypohippus, near affinis Leidy. Mt and M2, no. 21215, natural size. Barstow Miocene, Mohave Desert, California. A fragmentary upper molar, no. 21214, shows no characters more than that it is a large species of Hypohippus. Measurements of no. 21215 M1; approximate anteroposterior diameter mm. M„ greatest transverse diameter 20 M2, anteroposterior diameter M2, greatest transverse diameter M2, height of crown at middle of occlusal face A number of phalanges of digit three, the distal end of a meta- podial, several astragali, and a calcaneum from the Barstow collections apparently represent Hypohippus. The phalanges (figs. 29 and 30) are larger and relatively much wider or flatter than those of members of the Merychippus group. In the proximal phalanges of the third digit, the median groove for the distal keel of the metapodial is limited to the posterior region of the articular face. 30 Matthew, W. D., and Gidley, J. W., Bull. Am. Mus. Nat. Hist., vol. 22, p. 135, fig. 1, 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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