CONTENTS 



CHAPTER II. THE ENTEROCCELA AND THE CCELOMOCCELA, 

 CHAPTER III. SPONGES PHYLUM PORIFERA. 

 CHAPTER IV. THE HYDROMEDUSAE. 

 CHAPTER V. THE SCYPH.OMEDUSAE. 

 CHAPTER VI. THE ANTHOZOA. 

 CHAPTER VII. THE CTENOPHORA. 



