LIST OF ILLUSTRATIOXS 



PAGE 



Frog in action 3 



Giant salamander 4 



Slender cjEcilia — White-bellied cfecilia 5 



Congo snake 8 



Spadefoot frog 9 



Surinam toad and tadpole 10 



Flying tree-frog 11 



Head of frog 12 



Tooth of labyrinthodont 15 



Horned frog of South Auierica 16 



Common toad 20 



Green frog 20 



Bullfrog 21 



Tree-toad 21 



Crested newt, male and female 27 



Eggs of bird, toad, fish, butterfly, katydid, skate ... 31 



Development of frog 33 



Pouched frog .36 



Tree-frog of Dutch Guiana 37 



Axolotl, tadpole state 38 



Axolotl, adult 39 



Obstetric froff 40 



')r> 



Skeleton of frog 51 



xxi 



