CONTENTS. XV 



CHAPTER LVII. 



Ganoidei Sub-orders Lepidoganoidei Placoganoidei, . . 364-369 



CHAPTER LVII I. 



Elasmobranchii and Dipnoi Sub-orders of Elasmobranchii Holo- 



cephali Plagiostomi Dipnoi, ...... 370-377 



CHAPTER LIX. 

 Distribution of Fishes in time, ..... 377-38 



CHAPTER LX. 

 General characters of the Amphibia, . . . 381-383 



CHAPTER LXI. 



Orders of Amphibia Ophiomorpha Urodela Anoura Develop- 

 ment of Frog Families of Anoura Labyrinthodontia Distribu- 

 tion of Amphibia in time, ....... 384-392 



CHAPTER LXII. 



General characters of Reptilia Endoskeleton Exoskeleton Diges- 

 tive system Circulatory system Respiratory system, . . 393-397 



CHAPTER LXI 1 1. 



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, 397-407 



CHAPTER LXIV. 



Lacertilia Families of Lacertilia Distribution of Lacertilia in time 

 Crocodilia Sub-orders of Crocodilia Distribution of Croco- 

 dilia in time, .... 408-415 



CHAPTER LXV. 



Extinct orders of Reptiles Ichthyopterygia Sauropterygia Ano- 



modontia Pterosauria Dinosauria, ..... 416-422 



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, . 423-441 



CHAPTER LXVI I. 



General divisions of the class Aves Characters and families of the 



order Natatores Characters and families of Grallatores, . 441-450 



