vi CONTENTS 



PHYLUM CHORDATA Cant in ued. 

 Class II. Pisces Continued. 



PAOB 



Sub-class III. Teleostomi ... . 183 



1. Example of the Class Salnio fario 183 



2. Distinctive Characters and Classification 201 



Systematic Position of the Example . .... 207 



3. General Organisation .... .... 209 



Sub-class IV. Dipnoi - 229 



1. Example of the Class Ceratudus forsteri . . . 230 



2. Distinctive Characters and Classification . . . 239 



3. General Remarks . . 240 

 Appendix to Pisces The Ostracodermi ... . 243 



Class III. Amphibia . . . 245 



1. Example of the Class Rana temporaria .... 245 



2. Distinctive Characters and Classification . .... 271 

 Systematic Position of the Example 273 



3. General Organisation .... . 273 



Class IV. Reptilia . 291 



1. Example of the Class Lacerta .... ... 292 



2. Distinctive Characters and Classification . . 311 

 Systematic Position of the Example ... . 315 



3. General Organisation of Recent Reptilia . . . 315 



4. Extinct Groups of Reptiles . . 344 



Class V. Aves . 350 



1. Example of the Class Coliimba Una . . 351 



2. Distinctive Characters and Classification . ... 380 

 Systematic Position of the Example . . . 389 



.'5. General Organisation . . 389 



Sub-class I. Archreornithes .... . 390 



II. Neornithes . . 392 



Class VI. Mammalia 417 



1; Example of the Class L?iix run imhis 417 



"2. Distinctive Characters and Classification . . . 447 



Systematic Position of the Example . . 460 



General Organisation . 400 



The Mutual Relationships of the Choi-data . .575 



The Mutual Relationships of the Phyla of Animals . . 580 



