CONTENTS. XV 



CHAPTER LVII. 

 Ganoidei Sub-orders Lepidoganoidei Placoganoidei, . .412-418 



CHAPTER LVIII. 



Elasmobranchii and Dipnoi Sub-orders of Elasmobranchii Holo- 



cephali Plagiostomi Dipnoi, 418-426 



CHAPTER LIX. 



Distribution of Fishes in time, * 427-430 



CHAPTER LX. 



General characters of the Amphibia, ...... 431-433 



CHAPTER LXI. 



Orders of Amphibia Ophiomorpha Urodela Anoura Develop- 

 ment of Frog Families of Anoura Labyrinthodontia Distribu- 

 tion of Amphibia in time, 433-443 



CHAPTER LXII. 



General characters of Reptilia Endoskeleton Exoskeleton Diges- 

 tive system Circulatory system Respiratory system, . . 444-448 



CHAPTER LXIII. 



Divisions of Reptilia Chelonia General characters of Chelonian 

 Reptiles Distribution of Chelonia in time Ophidia General 

 characters of Snakes Sub-orders Distribution of Ophidia in 

 time, 448-460 



CHAPTER LXIV. 



Lacertilra Families of Lacertilia Distribution of Lacertilia in time 

 Crocodilia Sub-orders of Crocodilia Distribution of Croco- 

 dilia in time, . 460-471 



CHAPTER LXV. 



Extinct orders of Reptiles Ichthyopterygia Sauropterygia Ano- 

 modontia Pterosauria Dinosauria, ..... 471-479 



CHAPTER LXVI. 



General characters of the class Aves Feathers Vertebral column 

 Skull Pectoral arch and fore-limb Pelvic arch and hind-limb 

 Digestive system Respiratory system Circulatory system 

 Reproductive organs Nervous system and organs of sense, . 480-499 



CHAPTER LXVII. 



General divisions of the class Aves Characters and families of the 



order Natatores Characters and families of Grallatore . 499'S 11 



