xvi CONTENTS 



3. The Anatomy and Physiology of Fishes in General 



4. General Account of Some of the Principal Groups of 



Fishes 



5. Deep Sea Fishes 



6. Fossil Fishes ......... 



7. The Economic Importance of Fishes . 



CHAPTER XVIII 



SUBPHYLUM VERTEBRATA: Class IV. Amphibia 



1 . The Frog 



2. A Brief Classification of Living Amphibia 



3. Review of the Orders and Families of Living Amphibia 



4. General Remarks on Amphibia .... 



CHAPTER XIX 



SUBPHYLUM VERTEBRATA: Class V. Reptilia . 



1. The Turtle 



2. A Brief Classification of Living Reptilia . 



3. Review of the Orders and Families of Living Reptiles 



4. The Poisonous Snakes of North America 



5. The Economic Importance of Reptiles 



6. Prehistoric Reptiles ...... 



CHAPTER XX 



SUBPHYLUM VERTEBRATA: Class VI. Aves .... 



1. The Pigeon . 



2. A Brief Classification of Birds . t 



3. A Review of the Orders and Families of Birds 



4. A General Account of the Class Aves 



a, Form and Function, 616 ; b. The Colors of Birds, 

 621 ; c, Bird Songs, 621 ; d, Bird Flight, 621 ; e. Bird 

 Migration, 622 ; f, The Nests, Eggs, and Young of 

 Birds, 624; g, The Economic Importance of Birds, 

 626 ; h, Domesticated Birds, 630. 



