CONTENTS 



PAGE 



PREFACE v 



LIST OF ILLUSTRATIONS xi 



INTRODUCTION i 



SECTION I 



PHYLUM PROTOZOA 14 



I. The Rhizopoda 14 



II. The Mastigophora 34 



III. The Infusoria 44 



IV. The Sporozoa 55 



SECTION II 



THE METAZOA 59 



SECTION III 



PHYLUM PORIFERA 76 



SECTION IV 



PHYLUM CCELENTERATA 91 



I. The Hydrozoa 92 



II. The Scyphozoa 109 



III. The Actinozoa 115 



IV. The Ctenophora 125 



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