. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 28. Fig. 29. The faces of the occipital condyles look downward as well as inward,requiring the presence of an exceptionally large intercentrum for the firstvertebra; this intercentrum bore the main faces for the occipital condyles. The second vertebra, the axis, has the neural spine nearly twice as wide,anteroposteriorly, as the normal dorsal vertebrae. The anterior edge of thespine is thin, and separates the two halves of the spine of the first posterior zygapophyses are normal in size. The transverse pro
. Revision of the Amphibia and Pisces of the Permian of North America. Fig. 28. Fig. 29. The faces of the occipital condyles look downward as well as inward,requiring the presence of an exceptionally large intercentrum for the firstvertebra; this intercentrum bore the main faces for the occipital condyles. The second vertebra, the axis, has the neural spine nearly twice as wide,anteroposteriorly, as the normal dorsal vertebrae. The anterior edge of thespine is thin, and separates the two halves of the spine of the first posterior zygapophyses are normal in size. The transverse processesstand out prominently from the sides of the neural arch and bear faces forthe single-headed rib. The intercentrum is normal, but does not bear_^afacet on the posterior edge for the lower part of the rib head. The third vertebra is normal. The fourth vertebra resembles the others in all respects but the neuralspine; this is only one-half the size of those before and behind it. The upperend seems to fit into a notch formed by the overhanging anterior edge of the
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Keywords: ., bookcentury1900, bookdecade1910, bookidc, booksubjectpaleontology
