. Bulletin - American Museum of Natural History. Natural history; Science. 1906.] Matthew and Gidley, Miocene Mammals of S. Dakota. 149. Upper jaw, Loup Fork open fossettes in the upper teeth, (2) the greater complexity of the enamel foldings, and (3) the proportionally smaller and more rounded protocones. From N. occidentale this species differs in (i) its smaller size and (2) different propor- tions of the premolars, which are relatively broader trans- versely. Compared with N. whit- neyi it is distinguished by (i) its smaller size and (2) by the greater number of folds in the ... ,. , ° fig
. Bulletin - American Museum of Natural History. Natural history; Science. 1906.] Matthew and Gidley, Miocene Mammals of S. Dakota. 149. Upper jaw, Loup Fork open fossettes in the upper teeth, (2) the greater complexity of the enamel foldings, and (3) the proportionally smaller and more rounded protocones. From N. occidentale this species differs in (i) its smaller size and (2) different propor- tions of the premolars, which are relatively broader trans- versely. Compared with N. whit- neyi it is distinguished by (i) its smaller size and (2) by the greater number of folds in the ... ,. , ° fig. 14.—.\enhipparion dolichop'i 9.^. nov. enamel walls of the metaloph '/P^ specimen half natural size. No. 1086 ^ formation. Little White River, S. Dakota. in the upper teeth, (3) the more open fossettes, and (4) the more rounded forms of the proto- cones. The small portion of skull preserved in the type does not admit of many comparisons, but a distinctive feature is shown in the extreme forward position of the infraorbital foramen, which is placed directly above the space between p^ and ^ The masseter ridge extends but little farther forward than in A^ whitneyi. The lower jaw is much longer and more slender than in N. whitneyi, or any other known Miocene species of horse. The muzzle portion is proportionally longer than the average of a dozen specimens of Equus cabal- lus examined. The lower border of the ramus is bowed as in .Y. whitneyi and N. 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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