. Bulletin - American Museum of Natural History. Natural history; Science. 1906.] Matthew and Gidley, Miocene Mammals of S. Dakota. 145 The masseter ridge and malar fossa, which are preserved in No. 10827, also show some differences. The malar fossa is intermediate in comparative size and depth between P. m,irabilis and P. supremus but is undivided as in P. supremus. The masseter ridge is compara- tively thin and sharply defined. Meastirements, .Vo. 10836. Height of Antero-post. mesostyle. Diameters of dp ' 19 mm. mm. mm. " dp' 36 " " 17 " " dp3
. Bulletin - American Museum of Natural History. Natural history; Science. 1906.] Matthew and Gidley, Miocene Mammals of S. Dakota. 145 The masseter ridge and malar fossa, which are preserved in No. 10827, also show some differences. The malar fossa is intermediate in comparative size and depth between P. m,irabilis and P. supremus but is undivided as in P. supremus. The masseter ridge is compara- tively thin and sharply defined. Meastirements, .Vo. 10836. Height of Antero-post. mesostyle. Diameters of dp ' 19 mm. mm. mm. " dp' 36 " " 17 " " dp3 " 26 " 20 " " dp* 29 " 25 " 23 " " m» 28 " 26 " Total length of milk molar series, dp 2 to dp < 92 .5 mm. Neohipparion occidentale (Leidy). A few isolated teeth (No. 10827), apparently represent N. occi- dentale in the 1903 collection, but they add nothing to our knowledge of the species. Neohipparion gratum (Leidy). This species is resented by sepreveral specimens from the Little. Fig. ic.—Neohipparion gratum Leidy. .interior part of skull, side view, half natural size. No. 10863. La. _/>., lacrymal fossa ; ma. /s. malar fossa. White River. The most complete are a portion of skull with all the teeth except the molar-premolar series of one side (No. 10863), a complete pair of lower jaws (No. 10845), ^.nd two other lower jaws •Transverse diameter taken across base of tooth, not at triturating surface. \_May, igo6\.. 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 American Museum of Natural History; Allen, J. A. (Joel Asaph), 1838-1921. New York [American Museum of Natural History]
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