. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 507 Measurements No. 21423 No. 21424 No. 21425 M1, anteroposterior diameter mm. 24 M1, transverse diameter al9 24 M1, height of crown 39 37 a, approximate. The large protohippine horses of the Barstow fauna represented in Merychippus e. stylodontus, M. intermontanus, and the Protohippns or PUohippus described above, are antecedent types such as we might expect to find in the ancestors of the Ricardo and Etchegoin Protohippus and PUohippus species. PUohippus fairbanks
. Bulletin of the Department of Geology. Geology. 1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 507 Measurements No. 21423 No. 21424 No. 21425 M1, anteroposterior diameter mm. 24 M1, transverse diameter al9 24 M1, height of crown 39 37 a, approximate. The large protohippine horses of the Barstow fauna represented in Merychippus e. stylodontus, M. intermontanus, and the Protohippns or PUohippus described above, are antecedent types such as we might expect to find in the ancestors of the Ricardo and Etchegoin Protohippus and PUohippus species. PUohippus fairbanksi of the Ricardo fauna and P. coalingensis of the Etchegoin may either or both be derivations of Merychippus intermontanus of the Barstow. PUo- hippus tantalus is as yet imperfectly known, but may be a derivative of a form near one of the Barstow types. SUIDAE A single astragalus of a suilline form, no. 22469 (fig. 83), from locality 1398 in the Barstow beds rep- resents a dicotyline form, but a generic determina- tion seems doubtful. This specimen shows the pres- ence in this fauna of the peccary-like forms so well represented elsewhere in the American Fig. 83. Pros- the n nop s ?, sp. Astragalus, no. 22469, natural size. Barstow Miocene, Mohave Desert, Califor- nia. OREODONTIDAE MERYCOCHOERUS? BUWALDI, n. sp. Type specimen, no. 21350, an upper dentition from locality 2057, Barstow beds, Barstow syneline, north of Barstow, California. Fragmentary oreodont remains representing a form near Mery- cochoerus were found sparingly by Baker in the Barstow region in 1911. In 1913 Buwalda and Mourning found more abundant material showing a complete upper cheek-tooth series, and a considerable part of the lower dentition. This species is near Merycochoerus in general characters of the dentition and skull. It is at least as advanced as that genus in specialization of the premolars and in relative proportions of the molar and premolar Please note that these images are ex
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