On a Sacrum, apparently indicating a new type of Bird, Ornithodesmus cluniculus, Seeley, from the Wealden of Brook

  title={On a Sacrum, apparently indicating a new type of Bird, Ornithodesmus cluniculus, Seeley, from the Wealden of Brook},
  author={Harry Govier Seeley},
  journal={Quarterly Journal of the Geological Society of London},
  pages={206 - 211}
  • H. Seeley
  • Published 1 February 1887
  • Geology
  • Quarterly Journal of the Geological Society of London
The discovery of the pneumatic condition of the vertebræ in Ornithosaurs and certain Dinosaurs showed that they diverge from Reptiles in structural characters which are typically Ornithic. The augmented number of vertebræ in the sacrum in both those groups also shows a divergence from existing Reptiles, which is markedly Avian. On the other hand, the small number of sacral vertebræ found in the Archæopteryx has proved that a bird may have the sacrum no more complex than in Ornithosaurs and… 

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