. Zoology. Zoology. 152 ZOOLOGY. ness, and is coTercd with round scales. Tlie pectoral and ventral fins are long, narrow, and pointed, and tlie verte- bral column extends to the end of the caudal fin, which ends in a point, not being twodobed as in other fishes. The Australian lung-fish (Fig. 105) has but a single lung, It attains a length of six feet. It can breathe either by gills or lungs alone. Ordinarily it uses its gills, biit when the. Fig. 194-—Spoon-bill fish. From Liitkeu's Zoology. fish is compelled to live during droughts in thick muddy water charged with gases which are the produc
. Zoology. Zoology. 152 ZOOLOGY. ness, and is coTercd with round scales. Tlie pectoral and ventral fins are long, narrow, and pointed, and tlie verte- bral column extends to the end of the caudal fin, which ends in a point, not being twodobed as in other fishes. The Australian lung-fish (Fig. 105) has but a single lung, It attains a length of six feet. It can breathe either by gills or lungs alone. Ordinarily it uses its gills, biit when the. Fig. 194-—Spoon-bill fish. From Liitkeu's Zoology. fish is compelled to live during droughts in thick muddy water charged with gases which are the product of decom- posing organic matter, it is obliged to use its lungs. It lives on the dead leaves of aquatic grasses, etc. The local English name is "fiat-head,"' the native name being "bar- ; The African lung-fish (Fig. 196) has two lungs. It lives Fia. 195.—Ceraforftw, or Australian Lnng-flsh. (The tail in nature ends in a point.) on leaves in the White Nile, the Niger, and Gambia rivers, where it buries itself in the mud a foot deep. A similar lung-fish {Lepidosiren) lives in the rivers of Brazil, and the closely allied Profopterus in tropical Africa. Ceraiodus makes use of the lungs mainly when the muddy water is saturated witli gases from organic matter. Finally we come to those American Ganoids whose skelc-. 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt
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