. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. PEDIGREE AND KINSHIPS suggest the legs of the salamanders, although less leglike in structure than the paired fins of the fringe-fins. Young lungfishes, like embryo sharks and salamanders, possess external gills. These almost wholly disappear with age, and the small covered gills that remain are unable to supply the respiratory needs, so that the animal must rise to the surface at intervals for air, like a frog. The cellular air bladder serves as a lung. The South American species, at least, is reported to breathe as con
. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. PEDIGREE AND KINSHIPS suggest the legs of the salamanders, although less leglike in structure than the paired fins of the fringe-fins. Young lungfishes, like embryo sharks and salamanders, possess external gills. These almost wholly disappear with age, and the small covered gills that remain are unable to supply the respiratory needs, so that the animal must rise to the surface at intervals for air, like a frog. The cellular air bladder serves as a lung. The South American species, at least, is reported to breathe as con- tinuously and as rythmically as a mammal. During the rainy season the South American lungfish lives in swamps a few feet deep. When the dry season comes it burrows in the mud, closing its burrow at the top with a lid of. mi^Siiii 9. Two lungfishes, A, Xeocerato^us of Australia, and B, LepUosiren of ^outh America. C, a salamander, Amphhana, showing close external resem- blance, in limbs, etc., to lungfish mud. The fish surrounds itself with a mucous secretion and during its aestivation closes its gill openings and breathes through the mouth, the air reaching it through the perforated clay lid of its burrow. When the rainy [19]. 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 Hildebrand, Samuel F. (Samuel Frederick), 1883-1949; Gilmore, Charles Whitney, 1874-; Cochran, Doris M. (Doris Mable), 1898-1968. [New York, Smithsonian institution series, inc. ]
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Keywords: ., bookcentury1900, booksubj, booksubjectfishes, booksubjectreptiles
