Abstract
V.
WHEN the investing bones, mentioned in the last paper, are removed, the chondro-cranium of the axolotl is seen to have a far lower structure than that of the salmon. The hinder part of the skull-floor is constituted by a flat plate of cartilage (Fig. 13, B.O) formed from the investing mass, and answering to the basi-occipital, but unossified. From this rises up on each side a narrow cartilaginous pedicle, which, uniting above with its fellow, forms the occipital ring inclosing the| foramen magnum. An ossification-the exoccipital-is formed on each side of this arch where it bears the occipital condyles; but, as in all amphibia, the supra-occipital, like the basi-occipital region, remains cartilaginous.
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Report of Prof. Parker's Hunterian Lectures “On the Structure and Development of the Vertebrate Skull” * . Nature 10, 167–168 (1874). https://doi.org/10.1038/010167a0
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DOI: https://doi.org/10.1038/010167a0