6 CONTENTS 



PAGE 

 COELENTERATES II7-I24 



Sea Anemone ii7 



The Fresh Water Hydra ii8 



The Starfish . . .121 



Worms 125-137 



The Earth Worm . 125 



The Nereis .... ... 130 



The Leech 131 



A Planarian Worm ... . 132 



The Liver Fluke .... . . ... 133 



The Tapeworm 135 



MoLLusKS . ... 138-148 



The Fresh Water Mussel 138 



The Snail .... . 144 



Vertebrates . .... 149-215 



The Fish 149 



The Frog . . ....... 161 



The Pigeon .... . 177 



The Rabbit 198 



Appendix . . ... . 216 



Glossary 227 



