. The biology of the frog . atural History.) are the mud puppies or water dogs, which belongto the genus Necturus. Nee turns maeulosus is the mostabundant species. It occurs in the northern and easternpart of the United States, west of the Alleghanies, and isespecially abundant in the region of the Great Lakes. Itsgeneral color is brown above, marked with darker spots, anda dirty white or dusky color below. It has bushy red gills,which are kept moving back and forth at frequent most amphibians, it is most active at night; during theday it lies concealed out of the reach of light
. The biology of the frog . atural History.) are the mud puppies or water dogs, which belongto the genus Necturus. Nee turns maeulosus is the mostabundant species. It occurs in the northern and easternpart of the United States, west of the Alleghanies, and isespecially abundant in the region of the Great Lakes. Itsgeneral color is brown above, marked with darker spots, anda dirty white or dusky color below. It has bushy red gills,which are kept moving back and forth at frequent most amphibians, it is most active at night; during theday it lies concealed out of the reach of light. The family Sirenidse is represented by two genera, Sirenand Pseudobranchus, both of which are confined to North I THE AMPHIBIA IX GENERAL 5 America. Each genus contains but a single species. Thelarger of these, Siren laceriina, is found in the rivers andponds of the Southern States, from Texas to North Caro-lina. The body is long and snakelike in appearance. Thefore legs are very short and situated close behind the exter-. FlG. 2. — Siren lacertina. (From the Cambridge Natural History.) nal gills; the feet are four-toed. There are three pairs ofgill slits. The genus Pseudobranchus has only one pairof gill slits instead of three, and the feet possess but threetoes. The single species, P. striates, occurs in Georgia andFlorida. The Amphiumidae include forms of quite diverse appear-ance, which are sometimes placed in distinct families. Thegenus Amphiuma is represented by a single species, A. means,found in the Southern States of North America. The bodyis eel-like, with the very small legs situated far apart, nearthe two extremities. There is a single pair of gill slitsbehind the head, near the fore legs. The length of thisspecies is often over two feet. The female lays her eggs inthe latter part of the summer, and lies coiled about them insome protected spot, until they hatch. The genera Cryptobranchus and Megalobatrachus aresometimes placed in a distinct family, the Cryptobra
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