. Principles of economic zoo?logy. Zoology, Economic. CLASSIFICATION OF AMPHIBIA 231 The water-dog or mud-puppy (Fig. 188) (Ncciu'rus macula'tiis) is a rather common, clumsy form found in the Mississippi Valley and the region of the Great Lakes and east to the AUeghenies. They are nocturnal, but vora- cious, feeding on insects, worms, small fish, and crustaceans. Those in our laboratory were 15 inches long with dark brown spots. The blind Pro'leus angui'nus of Europe (Fig. 189) belongs to this family. It is white and lives in total darkness in a temperature of about 50° F. If brought to the li
. Principles of economic zoo?logy. Zoology, Economic. CLASSIFICATION OF AMPHIBIA 231 The water-dog or mud-puppy (Fig. 188) (Ncciu'rus macula'tiis) is a rather common, clumsy form found in the Mississippi Valley and the region of the Great Lakes and east to the AUeghenies. They are nocturnal, but vora- cious, feeding on insects, worms, small fish, and crustaceans. Those in our laboratory were 15 inches long with dark brown spots. The blind Pro'leus angui'nus of Europe (Fig. 189) belongs to this family. It is white and lives in total darkness in a temperature of about 50° F. If brought to the light the skin will ultimately change to a dark color. There is a similar species {Typhlomol'ge ralh'huni) in Texas. Family Amphi'umidse.—These animals are without gills in the adult stage. They have teeth in both jaws. They have four small, weak limbs. The hellbender {Cryptobrmi'chus alleghanien'sis) is a stout-bodied, four- footed, ugly, but harmless amphibian, which is sometimes 2 feet in length. It is brown or gray above and lighter below. It feeds on worms, crayfish, fish, and such other creatures as it can obtain in its aquatic haljitat. It is restricted in its distribution to the streams of the mountainous regions of the eastern United Fig. 190.—Congo snake {Amphiu'ma me'ans). (From Holder's "Elements of Zoology," American Book Co., Publishers.) The giant salamander of Japan (C japon'icus) reaches a length of 4 to 5 feet. It lives in small streams and mountain meadows of Japan and China, from 600 to 4500 feet above sea-level. Sasaki reports that it lives singly, lying concealed under rocks, in swift, thickly shaded, small, clear, cold streams. It feeds on animals which it can capture in the water and may be caught with a fish-hook. It is used for food by the Japanese. The "Congo snake" (Amphiu'ma me'ans) (Fig. 190) is eel-like, with four weak limbs, having two or three toes each. Its general color is black, with lighter under parts. It att
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