54 ELEMENTS OF COMPARATIVE ZOOLOGY. 



Another interesting form is the flying tree-toad of the 

 East Indies, in which the feet with the web between the 

 toes become greatly enlarged, forming large disks, upon 

 which the animal sails, much as does a flying squirrel upon 

 its lateral folds of skin. 



OKDER III. CECILIA (Blindworms). 



These are legless, worm-like Batrachia found in the 

 tropics of both hemispheres. They have a rudimentary 

 tail, degenerate eyes, and the larvae, so far as known, have 

 three pairs of gills. Some species form an exception to all 

 living Batrachia in having scales in the skin. 



COMPARISONS. 



Fishes and Batrachia. For the latter use your notes and 

 the preceding account. 



(1) Is the blood cold or warm ? 



(2) Are median fins present ? 



(3) Are gills present in young or adult ? 



(4) Are lateral-line organs present ? 



