Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 340 SYSTEMATIC ZOOLOGY. comparatively small, the largest being the giant sala- mander of Japan, which may be three to four feet in length. Existing Amphibia are conveniently divided into three groups or orders: Csecilia, Urodela, and Anura. ORDER I.—CSECILIA (Blindworms). These are legless, worm-like Amphibia found in the tropics of both hemispheres. They have a rudimentary tail, degenerate eyes, and the larvae, so far as known, have three pairs of gills. Some species form an exception t
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 340 SYSTEMATIC ZOOLOGY. comparatively small, the largest being the giant sala- mander of Japan, which may be three to four feet in length. Existing Amphibia are conveniently divided into three groups or orders: Csecilia, Urodela, and Anura. ORDER I.—CSECILIA (Blindworms). These are legless, worm-like Amphibia found in the tropics of both hemispheres. They have a rudimentary tail, degenerate eyes, and the larvae, so far as known, have three pairs of gills. Some species form an exception to all living Amphibia inliaving scales in the skin. While highly modified in some respects, in others they are the lowest in position. They live a burrowing life, feeding upon earth- worms, insects, etc., found in the soil. ORDER II.—URODELA (Salamanders, Newts, etc.). These forms retain the tail throughout life, and have the extremities weakly developed, fitted for creeping rather than jumping. Some live in the water throughout life, while others, as adults, are to be sought in moist places. FIG. 140.—Salamander (Plethodon). In some forms the external gills are retained permanently. The order belongs almost exclusively to the northern hemisphere, and is especially well developed in America. Allied to the Urodelans and Csecilians are some enormous
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