Note on the Os Pubis and Ischium of Ornithopsis eucamerotus

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Abstract
In four communications on remains of this remarkable aberrant form of Dinosaur which the Society has published in its Quarterly Journal, I have described and figured its cervical and thoracic vertebræ, and noticed the affinity which these suggest with Ceteosaurus oxoniensis , and also with certain North-American Dinosaurs described by Profs. O.C. Marsh and Cope. At the date of my last communication (1879), I was unable to lay before the Society any information respecting the vertebræ behind the thorax, or the girdle- and limb-bones. None of these had been found by Mr. Fox or myself in such close association with vertebræ of the forms I described as to demonstrate that they were parts of one skeleton; and in the absence of this, the expectation that the posterior vertebræ and the other bones should exhibit a textural and constructive agreement with the vertebræ known to us constituted during several years an insuperable obstacle to their identification. The removal of this prejudice we owe to the recovery in Colorado of a large series of remains of allied forms, in excellent preservation, which demonstrate in the posterior vertebræ the absence of the side pits and chambers that are so conspicuous a feature in the cervical and thoracic centra, and the solidity of the posterior centra, as also of the girdle- and limb-bones.

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