Notes on the Osteology and Relationship of the Fossil Birds of the Genera Hesperornis Hargeria Baptornis and Diatryma

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Page 547 - ... itself to the curvature of the body. The suggestion may be made here that perhaps the ankylosis of scapula and coracoid which occurs among struthious birds may be of more value than is usually accorded it. This ankylosis occurs in these birds only, while the scapula and coracoid are in young birds suturally united as in dinosaurs.
Page 550 - ... ancestor is an entirely different proposition, but if such be the case we must go far back in time to seek for this hypothetical form. And it must ever be borne in mind in dealing with birds that our knowledge of early forms is extremely slight, so that we have a very small foundation of facts for a verv large edifice of theory, a pyramid resting on its apex, as it were.
Page 546 - ... points being the shape of the distal end of the clavicle and the fact that the scapula and coracoid do not lie practically in the same plane, but the angle formed by them is little more than a right angle, which is different from what is found among struthious birds. That the scapula and coracoid...
Page 548 - ... proximal part of the clavicles which disappears, leaving the heavier distal portion attached to the coracoids. The complete separation of the clavicles and the. fact that the proximal portion is much the heaviest is also a generalized condition. The scapular arch of Hesperornis may be thus...
Page 550 - ... the nostril does not take place until very much later, or apparently just before the young takes to the water. As previously noted by Mr. Pycraft, a trace of the nostril remains in the shape of a minute orifice closed by horn. My own interpretation of the maxillo-palatines differs from that of Mr.
Page 551 - Hesperornis, and apparently without a precoracoid process or perforation; an articulation is present for the reception of the clavicle, but this latter bone was not preserved. Only the proximal portion of one scapula, the left, is present; this indicates a stout bone, and there is a suggestion that it may have expanded distally, as in...
Page 551 - Hesperornis, well forward in the dorsal region, in contrast to what occurs in modern water birds, such as penguins, auks, and loons, in which the hypapophyses begin immediately in advance of the sacrum and are longest about the middle of the series. This would throw the center...
Page 552 - ... formed, bear the muscular impressions of much larger wing bones, and imply the presence of quill feathers, and not improbably the use of the wings in conjunction with FIO.
Page 548 - ... presents an interesting combination of characters, on the one- hand showing generalized features and on the other close resemblances to modern birds. Thus we have in the Cretaceous a bird with a palatal structure quite unlike that of any struthious bird and with a vestigial wing which yet preserves many features found in the limbs of birds possessed of the power of flight.
Page 544 - ... the exact arrangement of the palatal bones, although it is apparent that this was quite different from that found among existing birds, either the Drormeognathas or Eurhipidunv.

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