CLASS AMPHIBIA 



513 



small and concealed under the skin or maxillary bones. A 



sensory tentacle which can be protruded from between the eyes 



and the nose aids the animal in crawling about. They feed on 



small invertebrates. Most of the 



ccecilians lay eggs, but some are 



viviparous. Ichthyophis glutinosa 



(Fig. 427), which lives in India, 



Ceylon, and the Malay Islands, and 



is about one foot long, has been 



more carefully studied than any 



other species. 



Order 2. Caudata. — The tailed 

 Amphibia differ so widely from one 

 another that it has been found 

 necessary to recognize three sub- 

 orders. 



Suborder 1. Proteida. — This suborder contains a single 

 family, Proteid^e, the mud-puppies, and three genera, Necturus, 

 Typhlomolge, and Proteus, with one species each. Necturus 

 maculosus (Fig. 428) is confined to the rivers and lakes of the 

 northern and eastern part of the United States, west of the Alle- 

 ghanies. It breathes by means of bushy red gills which extend 

 out from in front of the fore legs. The food of Necturus consists 

 chiefly of crustaceans, frogs, worms, insects, and small fishes. 

 During the day the mud-puppy lies concealed in a dark place, 



Fig. 427. — A legless am- 

 phibian, Ichthyophis glutinosa, 

 female guarding her eggs. (From 

 the Cambridge Natural History, 

 after Sarasin.) 



Fig. 428. — The " mud-puppy," Necturus maculosus. (From Mivart.) 



but at night it swims or crawls about with wavy movements 

 of the body, 



Proteus anguinus is a protean about one foot long, which has \ 



2 L 



