CONTENTS 



CHAPTER II. THE ENTEROCCELA AND THE CCELOMOCCELA. 

 CHAPTER III. SPONGES PHYLUM PORIFERA. 

 CHAPTER IV. THE HYDROMEDUSAE. 

 CHAPTER V. THE SCYPHOMEDUSAE. 

 CHAPTER VI. THE ANTHOZOA. 

 CHAPTER VII. THE CTENOPHORA. 



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