. Chordate morphology. Morphology (Animals); Chordata. in the middle of the body. About half way along the length of the tail, the transverse processes disappear, but the breakage lines occur to the tip of the tail. The vertebrae, with the exception of the atlas and axis, are procoelous— hollowed in front, but with a bulging articular surface be- hind (Figure 6-10). Tuatara The neural arches of Sphenodon do not retain the line of suture with the body as in the alligator, and an in- tercentrum is present between all of the vertebrae. There are 8 cervicals, unless one excludes the last, which be
. Chordate morphology. Morphology (Animals); Chordata. in the middle of the body. About half way along the length of the tail, the transverse processes disappear, but the breakage lines occur to the tip of the tail. The vertebrae, with the exception of the atlas and axis, are procoelous— hollowed in front, but with a bulging articular surface be- hind (Figure 6-10). Tuatara The neural arches of Sphenodon do not retain the line of suture with the body as in the alligator, and an in- tercentrum is present between all of the vertebrae. There are 8 cervicals, unless one excludes the last, which bears a large nb. This rib, however, is without a costal segment attaching to the sternum. There is a small preatlas neural arch to either side in the ligament joining the atlas, a ring of 3 pieces, to the skull (Figures 6-5 D, 6-6). The atlas neural arches do not meet dor- sally. The body of the axis has the expected composition; its centrum is fused with its intercentrum, with the centrum of the first cervical, and, perhaps, with the centrum of the preatlas (Figure 6-9). The third cervical has a transverse process, but no rib. There is a two-headed, connective tis- articulotion area on prezygapaphysis B intercentrum first haemal arch (intercentrum or chevron. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jollie, Malcolm. New York, Reinhold
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