CONTENTS 



Chapter II. — The Enteroc(ela and the Ccelomoccela. 

 Chapter III. — Sponges — Phylum Porifera. 

 Chapter IV. — The Hydromedusae. 

 Chapter V. — The Scyphomedusae. 

 Chapter VI. — The Anthozoa. 

 Chapter VII. — The Ctenophora. 



