A Pliocene fauna from Western Nebraska / by W.D. Matthew and Harold J. Cook.

  • Matthew, William Diller, 1871-1930.
Date:
1909
Catalogue details

Licence: In copyright

Credit: A Pliocene fauna from Western Nebraska / by W.D. Matthew and Harold J. Cook. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    vachyodon. M2 is rather small, long-oval as in JElurodon, not quadrate as in Hycenognaihus; and there is a smaller oval alveolus for a single-rooted m8. The jaw is massive, deep, and with strongly convex inferior border beneath the molars, as in other TElurodons. In Ilyamognathus the depth is less, the convexity of the inferior outline more posterior, the symphyseal region more massive, the anterior premolars shorter, not transverse, ]>x absent, and there is not metaconid on the carnassial. iElurodon ssevus secundus, mut. nov. Type, No. 13831, a lower jaw with ps-m2, and alveoli of the remaining teeth except the incisors. This jaw agrees in size with the type of jE. scevus Leidy, but the premolars are more reduced and crowded, and' the jaw shorter, than in the type or any of the referred specimens. The anterior Fig. 3. JElurodon scevus secundus, lower jaw, type specimens, external \ie\\ X 3, and crown view of teeth natural size. premolars are shorter than in HE haydeni validus, and are not set transversely to the tooth line; the second molar is shorter and relatively smaller. It stands nearer in these respects to Hyesnognathus than does the preceding form. .ffilurodon sp. div. indet. \ third jaw, No. 13832, a little larger than No. 13831, is doubtfully referable to M. scevus. The jaw is not so deep, the tubercular molars are more elongate, and m3 is set in the base of the eoronoid process, somewhat