CONTENTS. 



PAGE 



INTRODUCTION 1 



Definition of Zoology 1 



Morphology 5 



Organs and their Functions 8 



Correlation of Organs 9 



Adaptation of Organs 10 



Analogy and Hoinology 12 



Physiology 12 



Psychology 12 



Reproduction 13 



Embryology 13 



Classification 13 



Zoogeography 16 



CHAPTER I. Branch 1. PROTOZOA 17 



II. " 2. PORIFERA (Sponges) 42 



III. " 3. CCELENTERATA (Hydroids, Jelly-fishes, 



and Polyps) 51 



IV. " 4. ECHINODERMATA (Crinoids, Starfish, 



Sea Urchins, etc 96 



V. " 5. VERMES (Worms) 138 



VI. " 6. MOLLUSCA (Bivalves, Snails, Cuttles)... 240 



VII. " 7. ARTIIROPODA (Crustaceans and Insects) 285 



VIII. 8. VERTEBRATA 389 



IX. COMPARATIVE ANATOMY OF ORGANS 631 



Organs of Digestion, the Mouth and Teeth. . . 631 



Organs of Circulation 635 



Organs of Respiration 637 



The Nervous System 638 



Organs of Sense , 640 



