. A manual of zoology. 334 MANUAL OF ZOOLOGY neural arches enclose a canal, the neural canal, on the dorsal side of the centra. By the interlocking of certain processes — the articulating processes — of the neural arches the vertebrae in the lizard and rabbit are yet more firmly united together. In the dogfish the centra have deeply concave anterior and posterior faces, so that when the vertebrae are in posi- A f-* B. Fig. 209.—A, three trunk vertebrae of Scyllium from the side; B, a single trunk vertebra viewed from one end; C, three caudal vertebrae from the side; D, a single caudal vertebra
. A manual of zoology. 334 MANUAL OF ZOOLOGY neural arches enclose a canal, the neural canal, on the dorsal side of the centra. By the interlocking of certain processes — the articulating processes — of the neural arches the vertebrae in the lizard and rabbit are yet more firmly united together. In the dogfish the centra have deeply concave anterior and posterior faces, so that when the vertebrae are in posi- A f-* B. Fig. 209.—A, three trunk vertebrae of Scyllium from the side; B, a single trunk vertebra viewed from one end; C, three caudal vertebrae from the side; D, a single caudal vertebra from one end. c, centrum; h. a, haemal arch; 71. a, neural arch; tr. pr, transverse process. (After Hasse.) tion there are hollows of considerable extent between the centra formed by the apposition of these concave faces. This form of centrum is termed amphiccelous. The entire spinal column is distinguishable into two regions, — the region of the trunk in front and the region of the tail. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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