. A manual of zoology. Fig. 238. — A, ctenoid scale; B, ganoid scale. (After Giinther.) shagreen of sharks, or as in many globe-fishes of long bony spines ; lastly, in Polypterus (Fig. 239) and Lepidosteus are found rhomboid or ganoid scales in the form of rhomboidal plates of bone covered externally by a layer of enamel or ganoin and joined together by pegs and p*if Fig. 239.—Polypterus birchir. A, entire animal; B, ventral view of throat, an, anus; br. m, branchiostegal membrane; , caudal fin; , dorsal finlets; jug. //, jugular plates: na, nostril: , pectoral fin; pi'.f,
. A manual of zoology. Fig. 238. — A, ctenoid scale; B, ganoid scale. (After Giinther.) shagreen of sharks, or as in many globe-fishes of long bony spines ; lastly, in Polypterus (Fig. 239) and Lepidosteus are found rhomboid or ganoid scales in the form of rhomboidal plates of bone covered externally by a layer of enamel or ganoin and joined together by pegs and p*if Fig. 239.—Polypterus birchir. A, entire animal; B, ventral view of throat, an, anus; br. m, branchiostegal membrane; , caudal fin; , dorsal finlets; jug. //, jugular plates: na, nostril: , pectoral fin; pi'.f, pelvic fin; , ven- tral fin. (After Cuvier.) B pi In the sturgeon the spinal column consists of a persistent notochord with cartilaginous arches ; in the rest bony verte- brae are present, the centres of which are nearly always 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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