. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. Fig. 288.—Thornback (Raia clavata). European seas. 2. Ganoidei, distinguished by their enameled scales or bony plates. The endoskeleton is usualty not completely ossified; the ventral fins are placed far back; and the tail is generally heterocercal. The gills are like those of the bony Fishes, and the air-bladder has a duct, and may aid in respiration. This was one of the largest orders in old geological history. The few modern representatives, as the Stur
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. Fig. 288.—Thornback (Raia clavata). European seas. 2. Ganoidei, distinguished by their enameled scales or bony plates. The endoskeleton is usualty not completely ossified; the ventral fins are placed far back; and the tail is generally heterocercal. The gills are like those of the bony Fishes, and the air-bladder has a duct, and may aid in respiration. This was one of the largest orders in old geological history. The few modern representatives, as the Sturgeon, Gar-pike, Mud (or Dog) Fish, and Polyp- terus, are essentially fresh-water. 3. Teleostei, in- cluding all the com- mon Fishes having. a bony endoskeleton Fig. 289.—Gar-pike (Lepidos'eus osseus). Lake Ontario. 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
