(3) Pelvic, all those which are fused with the iliac portion of the pelvis, generally a considerable number.
In many birds some of the thoracic vertebrae are more or less coOssified, in most pigeons for instance the 15th to 17th; in most Galli the last cervical and the next three or four thoracics are coalesced, &c. The pelvic vertebrae include of course the sacrum.
13), consisting of the sacrum (already described) and the pelvic arch, namely ilium, ischium and pubis, it follows that only birds and mammals possess a pelvis proper, whilst such is entirely absent in the Amphibia and in reptiles with the exception of some of the Dinosaurs.
Johnson, " On the Development of the Pelvic Girdle and Skeleton of the Hind-limb in the Chick," Q.J.M.S., xxiii., 1883, pp. 399-4 11; K.
In the pelvic region, from about the level of the posterior end of the ischiadic plexus, the strand of each side becomes single again, passing ventrally over the transverse processes.
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