This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1901 Excerpt: ...e.g. Platemys and Chelys, however, all the parts
of the atlas co-ossify and form a complete, solid vertebra which
articulates by a concavo-convex joint with the centrum of the
second vertebra. The normal number of cervical vertebrae is eight
in all Chelonians. The first spinal nerve issues between occiput
and atlas, all the others behind the neural arches of their
vertebrae. The Ust, or eighth cerThe second basi-vical, owing to
the retractility of the neck. ventral (white) is attached, ., ., .,
r...., to the posterior end of the forms elaborate joints; its
centre fits with first centrum, which, not a knob into a cup of the
ninth, and its being fused with the second, - j i centrum, is not
yet an post-zygapophyses form broad, curved odontoid process. 2,
The articulating concave facets for the receii complete atlas of an
adult., gangtiicus, still tion ot the anterior zygapophyses ot the
typically temnospoudylous. fixcd uintl vertebra. In the
Trionychidae: , The hrst and second cer-vertebrae of an adult the
zygapophyses are most elaborate, and.The i complete they alone
articulate wjth the llilltll atlas of a Clielys fimbrtata.." tebra,
while tlie centra do not join, but remain, or rather become,
separated by partial resorption. In the Chelonidae, in conformity
with the non-retractile and short neck, all the cervical joints are
much reduced. The skull (cf. Fig. 54, H, I, K, p. 280) agrees
fundamentally with that of Sphenodon and of the Crocodilia, but it
is characterised by several special features. There are no
ectopterygoids or ossa transversa; no lacrymal bones, no
interparietal or pineal foramen; the vomer is unpaired and the
nasal bones are mostly absent, unless they are fused with the
prefrontals. The premaxillae are very small. The single vomer fo...
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