. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. : VKKTHIiRATHS FROM MONTANA 'I'KR'riARV. lof) Merycodiis nccatus Leidy. Af(-rycodus ? agi/is (Douglass). Palicomcryx amcricanus Douglass. Palceomcryx borealis (Cope). Mastodon. These beds overlie the ^^'hite River and occupy the top of the trian- gular bench between the Madison anddallatin rivers from the vicinity of Logan on the north, nearly to Elk Creek on the south ; also the tops of the high bench west of the Madison River. Descriptions of New Genera and Species. All the fossil
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. : VKKTHIiRATHS FROM MONTANA 'I'KR'riARV. lof) Merycodiis nccatus Leidy. Af(-rycodus ? agi/is (Douglass). Palicomcryx amcricanus Douglass. Palceomcryx borealis (Cope). Mastodon. These beds overlie the ^^'hite River and occupy the top of the trian- gular bench between the Madison anddallatin rivers from the vicinity of Logan on the north, nearly to Elk Creek on the south ; also the tops of the high bench west of the Madison River. Descriptions of New Genera and Species. All the fossils described in this paper were collected by the writer, unless otherwise stated. The drawings were made by Mr. S. Pren- tice. The numbers given to the specimens are the Carnegie Museum numbers. EOCENE? (Sage Creek Beds.^ PERISSODACTYLA. Heptodon ? No. 717. Fig. I. Part of a superior maxillary with the last premolar ai.^ tne three molars on the left side. From the Sage Creek beds northeast of Lima. It is doubtful whether this should be assigned to the genus Heptodon or to Systemodon. Taking Dr. Wortman's distinguishing characters of the teeth it is intermediate between the two. A comparison with the specimens in the American Museum of Natural History confirms this, but it seems to be nearer to Heptodon than to Systemodon, appearing to be some more primitive form of that genus. The cross crests are low. The pos- terior outer cusp in M^ is flat and pushed far inward, making the meta- loph very short, and the tooth nearly an equilateral triangle in outline as seen from above. In M- the posterior outer cone is a trifle convex outwardly, though it is slightly concave near the posterior edge. In. Fig. I. Heptodon? (717), Sage Creek Beds. Natural size. a. Part of left maxillary with last premolar and three molars, b. Crown view of teeth of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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