LIMBS AND TOES 



ans. 



Some of the tailed forms have homy tips on 

 their toes all the time ; others have these at certain 

 seasons only, when they chase or grasp each, other. 

 These latter are on the fore feet, and are shed later. 

 In Africa, there is a frog armed with spurlike claws 

 on three toes of the hind feet, and our own spade- 

 foot toad (Fig. 5) has a flat spur on itp rear foot, which 

 is evidently used as a burrowing implement. 



The feet of the so-called Surinam toad (Fig. 6) 

 (Pipa) are tipped with a starlike sprangle. The rule 



Fig. 5.— Spadefoot frog (Smphiopus holbrooldi). 



among frogs and toads is that the rear toes are webbed 

 and the front ones are not. The length of rear toes 

 and the extent of the webs vary much. 



