. A manual of zoology. 393 MANUAL OF ZOOLOGY sect. left side. The under side is usually pure white, the upper dark. The eyes are both on the upper side, and the skull is distorted so as to adapt the orbits to this change of Fig. 237.—Pleuronectes cynoglossus (craig-fluke), from the right side. d. f, dorsal fin; / e, left eye; pet. /, pectoral fin; pv. f} pelvic fin; r. e, right eye; , ventral fin. (After Cuvier.) In many Teleostei, such as the eels, the skin is devoid of hard parts ; but in most cases there is an exoskeleton developed in the derm. In the majority this takes the
. A manual of zoology. 393 MANUAL OF ZOOLOGY sect. left side. The under side is usually pure white, the upper dark. The eyes are both on the upper side, and the skull is distorted so as to adapt the orbits to this change of Fig. 237.—Pleuronectes cynoglossus (craig-fluke), from the right side. d. f, dorsal fin; / e, left eye; pet. /, pectoral fin; pv. f} pelvic fin; r. e, right eye; , ventral fin. (After Cuvier.) In many Teleostei, such as the eels, the skin is devoid of hard parts ; but in most cases there is an exoskeleton developed in the derm. In the majority this takes the form of scales, rounded plates of bone embedded in pouches of the derm, and overlapping one another from behind for- wards. When the free border of the scales presents an even curve, they are called cycloid scales ; when the free edge is produced into small spines, they are distinguished as ctenoid scales (Fig. 238). In exceptional cases the scales may be so large and strong as to form a rigid armour. 1 Our common flounders are Paralichthys dentatus from the southern coast of New England, and Pscurfoplcuronectcs americanus from the coast north of Cape 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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