CONTENTS 



CHAPTER PAGB 



I. THE STORY OF ANIMAL LIFE .... 9 

 II. How ANIMALS ADAPT THEMSELVES TO CIR- 

 CUMSTANCES 13 



III. CLASSIFICATION : THE SORTING OF THE ANIMAL 



KINGDOM 30 



IV. THE ONE-CELLED ANIMALS, OR PROTOZOA . 45 

 V. THE COILENTERATA 53 



VI. THE SPONGES 63 



VII. THE VERMES OR WORMS 68 



VIII. THE ARTHROPODA: LOBSTERS, SPIDERS, AND 



INSECTS 76 



IX. THE MOLLUSCA, OR SHELL-FISH ... 98 



X. THE BRACHIOPODA, OR LAMP-SHELLS . . 117 



XI. THE MOSS-CORALS, OR POLYZOA . . .119 



XII. THE ECHINODERMATA 122 



XIII. THE CHORDATA 135 



XIV. THE VERTEBRATA 138 



XV. MAN 167 



XVI. How ZOOLOGISTS DO THEIR WORK . . . 180 



INDEX 193 



