. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 491 degree of cementation suggests Protohippus. The premolars forming in the jaw are large and might represent either M. c. stijlodontus or M. Fig. 54. Merychippus intermontanus? Merriam. Superior milk dentition with occlusal view of M1, no. 21460, natural size. Barstow Miocene, Mohave Desert, California. Fig. 55. Merychippus intermontanus Merriam. Inferior milk dentition with permanent M1( no. 21398, natural size. Barstow Miocene, Mohave Desert, Cali- fornia. Fig. 56. Me
. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 491 degree of cementation suggests Protohippus. The premolars forming in the jaw are large and might represent either M. c. stijlodontus or M. Fig. 54. Merychippus intermontanus? Merriam. Superior milk dentition with occlusal view of M1, no. 21460, natural size. Barstow Miocene, Mohave Desert, California. Fig. 55. Merychippus intermontanus Merriam. Inferior milk dentition with permanent M1( no. 21398, natural size. Barstow Miocene, Mohave Desert, Cali- fornia. Fig. 56. Merychippus intermontanus Merriam. Dm3, no. 21461, natural size. Barstow Miocene, Mohave Desert, California. In no. 21460 the upper milk molars (fig. 54) are somewhat larger than in no. 19816 though of much the same form. In no. 21460 the slightly worn crowns are high and well cemented. They seem as advanced as in Protohippus. In no. 21460 Ml is a large tooth com- parable in general to M1 of M. intermontanus, and it is not improbable. 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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