XVI 



CONTENTS 



PAGE 



3. The Anatomy and Physiology of Fishes in General 445 



4. General Account of Some of the Principal Groups c 



Fishes ........ 452 



5. Deep Sea Fishes 



6. Fossil Fishes 474 



7. The Economic Importance of Fishes .... 474 



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 .... 



477 



477 



510 



•512 



C22 



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 



527 

 527 



534 

 540 



570 

 572 



CHAPTER XX 



Class VI. Aves 



Subphylum Vertebrata 



1. The Pigeon 



2. A Brief Classification of Birds . 



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 I 

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

 626; h, Domesticated Birds, 630. 



75 



588 



593 

 616 



