CONTENTS. 



INTRODUCTION. page 



Definition of Zoology 1 



Metliod of Study 1 



Classification 2 



Paleontology 4 



Geographical Distribution 4 



How to Begin the Study of Zoology 5 



CHAPTER I. 

 Branch 1. Protozoa 6 



CHAPTER II. 

 Branch 2. Porifera (Sponges) 15 



CHAPTER III. 

 Branch 3. Ceelenterata (Hydroids, Jelly Fisljes, and Polypes) 19 



CHAPTEl{ IV. 



Branch 4. Vermes (Worms). .. . 37 



CHAPTER V. 



Branch 5. Echinodermata (Criuoids, Starfisli, Sea urchins, 



etc.) 54 



CHAPTER VI. 

 Branch 6. Mollusca (Bivalves, Snails, Cuttles) 64 



CHAPTER VII. 

 Branch 7. Arthropoda (Crustaceans and Insects) 78 



CHAPTER VIII. 

 Branch 8. Vertebrata 133 



