. Elements of zoölogy. Zoology. THE TRUE FISHES. 167 been seen so packing a river three hundred and sixty feet wide and twenty-nine feet deep, that the backs of the upper ones were out of the water. Order II. Lung-Fishes {Dipnoi).—The lung-fishes are eel-shaped, and covered with large scales. Some, as the Lepidosiren, have two perfect lungs, as well as gills. When left dry in pools, they form cases in the mud, which they line with a mucus, and lie dormant until the return of the water. The Ceradotus of Australia (Fig. 206), discov-. Fig. 206.—The Ceradotus of Queensland, Australia, an air-brea
. Elements of zoölogy. Zoology. THE TRUE FISHES. 167 been seen so packing a river three hundred and sixty feet wide and twenty-nine feet deep, that the backs of the upper ones were out of the water. Order II. Lung-Fishes {Dipnoi).—The lung-fishes are eel-shaped, and covered with large scales. Some, as the Lepidosiren, have two perfect lungs, as well as gills. When left dry in pools, they form cases in the mud, which they line with a mucus, and lie dormant until the return of the water. The Ceradotus of Australia (Fig. 206), discov-. Fig. 206.—The Ceradotus of Queensland, Australia, an air-breathing and water-breathing mud-fish of the ancient type, with paddle-fins. ered in 1870, attains a length of six feet. When under water the heart pumps the blood to the gills, but when they are deprived of it the gases from the air-chamber are expelled with a loud noise, and fresh air taken in, the blood being now carried the other way, or toward the chambered, lung-like air-bladder, to become freshened. Note.—The Protopterits, a lung-fish of Africa, has plume-like fins, and is also noted for its burrowing habits, forming burrows a foot from the surface. One, sent to England in its earthen case, came to life months after, when soaked in water. Some remain in their dry nests for several seasons. Many of the family have the faculty of reproduc- ing lost fleshy parts of their fins, etc. Order III. Branchioganoidei.—This order is repre- sented by the Polypterus of the Nile. The dorsal fin is broken up into numerous points, each being supported by. 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
