. A manual of zoology. PHYLUM CHORDATA 353 The spinal cord is similar in essential respects in all three examples. It is a cylindrical cord of nenx matter, having running along the middle of its dorsal surface a fissure, the VJ? JjoZ. Fig. 219. — Dorsal view of the brain of Scyllium canicula. The posterior division of the brain is the medulla oblongata (NH), on the dorsal surface of which is shown one of the central ventricles (F. rho). The large cerebellum {HH) nearly covers the optic lobes {MH). The diencephalon (ZH) shows in the middle one of the central ventricles, and the place of attachm
. A manual of zoology. PHYLUM CHORDATA 353 The spinal cord is similar in essential respects in all three examples. It is a cylindrical cord of nenx matter, having running along the middle of its dorsal surface a fissure, the VJ? JjoZ. Fig. 219. — Dorsal view of the brain of Scyllium canicula. The posterior division of the brain is the medulla oblongata (NH), on the dorsal surface of which is shown one of the central ventricles (F. rho). The large cerebellum {HH) nearly covers the optic lobes {MH). The diencephalon (ZH) shows in the middle one of the central ventricles, and the place of attachment of the pineal body (G/>). The prosencephalon {\'H) gives off the olfactory lobes ( Tro, L. of). The following nerves are shown: optic {II), trochlear {IV), trigeminal {V), facial (VII), auditory (VIII), glossopharyngeal {IX), and vagus {X). (From Wiedersheim.) dorsal longitudinal fissure, and along the middle of its ven- tral surface, a second fissure, the ventral longitudinal fissure. 2 A. 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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