Notice of new reptiles from the Laramie formation / by O.C. Marsh.

  • Marsh, Othniel Charles, 1831-1899.
Date:
[1892]
Catalogue details

Licence: Public Domain Mark

Credit: Notice of new reptiles from the Laramie formation / by O.C. Marsh. 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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    Various vertebrae found at the same localities may be re- ferred to this species. They are procoeliau, with the cup and ball transverse, and oblique. These are all without the zygosphene articulation. FiauRE 2.—Maxillary of GJiamoiJS segnis, Marssh ; outer view. Figure 3.—The same bone ; inner view. Twice natural size. The remains of the species here described are all from the Laramie of Wyoming. Iguanaviis teres, sp. nov. Another Lacertilian, much smaller than the above, left its remains in the same horizon. The specimens best preserved are vertebrjie,, whicli agree in general form of the centra \yith those just described, but possess the zygosphene articulation. They are about the size of the Opliidian vertebra above described, but may readily be distinguished by the oblique and transversely expanded articular faces, and by the smooth under surface of the centrum. The type specimens are all from the Laramie of Wyoming. Or7iithomimus sedens, sp. nov. The remarkable Dinosaurs described by the writer, and referred to the present genus, representing a distinct family, were mainly from fragmentary remains, but differed widely from all forms then known.* Since then explorations in the same horizon further north have brought to light various other specimens, which prove the group to be of great interest, but make it probable that they should be referred, not to the Ornithojpoda^ but to the Theropoda. The present species is based upon the nearly complete pelvis, with various vertebrae, and some other parts of the skeleton. The most striking feature of the pelvis is the fact, that the ilium, ischium, and pubis are firmly coossified with each other, as in recent birds. This character has been observed *This Journal, vol. xxxix, p. 84, January, 1890.