307 



FlG. 315. Epicrium glutinosum, one of the Gymnophiona ; larva, with external gills. A, 

 ge, with large yolk mass; B, more advanced. (After Sarasin, from Parker and 

 Haswell's Text-book.) 



America, Africa, and the East Indies, where they burrow in the 

 earth and feed on worms and the larvae of insects. Their rela- 

 tion to the other Amphibia is recognized in part from their 

 internal structure, and chiefly from their development, since a 

 larva is produced provided with external gills (Fig. 315). They 

 are known generally as caecilians, from the name of one of the 

 genera (Fig. 316). 



an 



FlG. 316. CcBcilia pachynema, one of the Gymnophiona. A, anterior extremity from tho 

 right side; B, posterior extremity from the ventral side, an, anus. (After Bou nger, 

 from Parker and Haswell's Text-book.) 



