3 2 ELEMENTARY ZOOLOGY 



sometimes gives rise to the false notion that they have 

 fallen with the rain. 



Coecilians (Gymnophiona). The third order of ba- 

 trachians, the ccecilians, includes about twenty species of 

 slender worm- or snake-like limbless forms which are 

 confined to the tropics. Some of them are wholly blind 

 and the others have only rudimentary eyes. In them the 

 skin is folded at regular intervals so that the body appears 

 to be rigid or segmented, and in some species there are 

 small concealed horny scales in the skin. 



