CONTENTS 



Page 



Preface to the Second Edition ix 



Preface to the First Edition xi 



CHAPTER I 



Introduction 1 



CHAPTER II 

 Phylum Protozoa 20 



CHAPTER III 

 Introduction to the Metazoa 59 



CHAPTER IV 

 Phylum Porifera 81 



CHAPTER V 

 The Goelenterates and Ctenophores 88 



CHAPTER VI 

 Phylum Plathelmint'hes 105 



CHAPTER VII 

 Phylum Nemathelminthes 128 



CHAPTER VIII 

 Phylum Trochelminthes 138 



CHAPTER IX 

 Phylum Coelhelminthes (Annelida) 148 



CHAPTER X 

 Phylum Molluscoidea 159 



CHAPTER XI 

 Phylum Echinoderma 165 



xiii 



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