. Elements of comparative zoology. Zoology. FIG. 138.—Larval stage of a salamander with external gills. From Hertwig. in those salamanders which lose the gills, by the growing together of the slits. In the frogs the process is preceded by the formation of an opercular fold (compare fishe>) in. FIQ. 139.—Side view of tadpole. e, eye; g, gill-opening; I, hind leg; m, mouth: n, nostril; v, vent. front of the gill region on either side. These folds grow back over the gill-slits, those of the two sides fusing below the throat and uniting with the wall of the body above * It has recently been sho
. Elements of comparative zoology. Zoology. FIG. 138.—Larval stage of a salamander with external gills. From Hertwig. in those salamanders which lose the gills, by the growing together of the slits. In the frogs the process is preceded by the formation of an opercular fold (compare fishe>) in. FIQ. 139.—Side view of tadpole. e, eye; g, gill-opening; I, hind leg; m, mouth: n, nostril; v, vent. front of the gill region on either side. These folds grow back over the gill-slits, those of the two sides fusing below the throat and uniting with the wall of the body above * It has recently been shown that some of the North American salamanders never develop lungs, but respire solely through the skin,. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
