244 VERTEBRATA: BATRACHIA OR BATRACHIAXS. 



FIG. 284. 





Blind-worm, Ccecilia. 



in length, and are found in the marshes of the tropical 

 regions. Contrary to what is true of batrachians gener- 

 ally, these animals develop dermal scales. 



SUB-SECTION V. 



THE ORDER OF LABYRINTHODONTA OR LABTRINTHODONTS. 



THE Labyrinthodonta are scale-covered batrachians 

 which, as already stated, are wholly extinct. They are 

 known only by their fossil remains. They get their name 

 from the labyrinthine arrangement of the cement and 

 dentine of the teeth, as seen in Fig. 285 a kind of struc- 

 ture which is found in the teeth of Ganoid fishes. These 

 batrachians were more or less frog-like in their general 

 outline. 



