CONTliXTS. XV 



CHAPTER LVII. 

 Gaiioidel — Sub-orders — Lepidoganoidei — Placoganoidei, . . 388-394 



CHAPTER LVIII. 



Elasmobranchii and Dipnoi — Sub-orders of Elasmobranchii — Ilolo- 

 cephali — Plagiostomi — Dipnoi, 394-402 



CHAPTER LIX. 

 Distribution of Fislies in time, ...«•.. 402-405 



CHAPTER LX. 

 General cliaracters of the Amphibia, ...■•. 406 408 



CHAPTER LXI. 



Orders of Amphibia — Ophiomorpha — Urodela — Auoura — Develop- 

 ment of Frog — Families of Anoura — Labyrinthodontia — Distribu- 

 tion of Amphibia in time, ....... 408-418 



CHAPTER LXn. 



General characters of Reptilia — Endoslieleton — Exoslceleton — Diges- 

 tive system — Circulatory system — Respiratory system, . . 419-423 



CHAPTER LXIII. 



Divisions of Reptilia — Chelonia — General characters of Chelonian 

 Reptiles — Distribution of Chelonia in time — Ophidia— General' 

 charactex-s of Snakes — Sub-orders — Distribution of Ophidia in 

 time 423-435 



CHAPTER LXIV. 



Lacertilia — Families of Lacertilia — Distribution of Lacertilia in time 

 — Crocodilia — Sub-orders of Crocodilia — Distribution of Croco- 

 dilia in time, 435-44S 



CHAPTER LXV. 



Extinct orders of Reptiles — Ichthyopterygia — Sauropterygia — Ano- 



modoutia — Pterosauria — Dinosauria, . '. . . v 445-452 



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, . 453-472 



CHAPTER LXVn. 



General divisions of the class Aves — Characters and. families of the 



order Natatores — Characters and families of Grallatores, . 472-484 



