. Animal forms; a second book of zoology. Zoology. THE AMPHIBIANS 177 In geological times many of the salamanders were of great size, several feet in length, and some were enclosed in an armor consisting of bony plates. All now living have the skin naked, and with the exception of the giant species of Japan, three feet in length, and a few similar forms in America, the modern representatives are comparatively. Fig. 108.—Blunt-nosed salamander {Amblystoma o])acum). Photograph by W. H. Fisher. feeble and measure their length by inches. Only a few, on account of their bright colors, are particula
. Animal forms; a second book of zoology. Zoology. THE AMPHIBIANS 177 In geological times many of the salamanders were of great size, several feet in length, and some were enclosed in an armor consisting of bony plates. All now living have the skin naked, and with the exception of the giant species of Japan, three feet in length, and a few similar forms in America, the modern representatives are comparatively. Fig. 108.—Blunt-nosed salamander {Amblystoma o])acum). Photograph by W. H. Fisher. feeble and measure their length by inches. Only a few, on account of their bright colors, are particularly attractive, while the others are usually shunned and considered re- pulsive, chiefly because of their supposed poisonous char- acter, though in reality few animals are more harmless. 169. Tailless forms.—In the frogs and toads the meta- morphosis which the young undergo is almost as profound as that which takes place with the insects. The gills, to- gether with their blood-vessels, disappear completely. The tail, with its muscles, nerve-supply, and skeleton, is ab- sorbed. The cartilaginous notochord gives way to a jointed back-bone. A skull is developed ; numerous bones form in the limbs, affording an attachment for the powerful muscles which make the toad, and especially the frog, expert swim-. 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 Jordan, David Starr, 1851-1931; Heath, Harold, 1868- [from old catalog] joint author. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
