Notice of new Tertiary mammals, V

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Abstract
THE remains here described are from the Eocene of the Rocky Mountain region.They include a new genus of Equine mammals, allied to Orohippus, but an earliet' and less specialized form, apparently in the direct ancestral line, and hence of much interest.All the specimens described are preserved in the Museum of Yale College.Eohippus validu8, gen.et sp.nov.This genus is very nearly related to Orohippu8, but may be readily distinguished from it by the dentition, the last premolar above and below being similar to the next premolar in front, and not like the adjoining true molar, as in Orohippus.In other respects, the teeth in the two genera are very much alike, and the dental formula is the same for both.The feet, also in theil' main features, are very similar, there being in each genus four well developed toes in front and three behind, but Eohippus has a rudiment of the outer, or fifth, metatarsal, and may have had a similar remnant of the first digit in the fore foot.The radius and ulna, and the tibia and fibula were distinct, and entire, and in most other respects the skeleton resem bled that of Orohippus,The present species is based mainly upon a fragmentary skeleton, with the principal teeth well preserved.These remains indicate an animal about as large as a fox, but of rather more robust proportions.Some of the more important measurements are as follows: Extent of three lower true molars __ .-.. ___________ .__ _ Antero-posterior diameter of last lower molar _______ .__
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openalex_W4240538103 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors O. C. Marsh
Journal american journal of science
Year 1876
DOI
10.2475/ajs.s3-12.71.401
URL
https://doi.org/10.2475/ajs.s3-12.71.401
Keywords Keywords not found

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