CONTENTS. 



On Eadiates in general 1 



General Sketch or the Polyps ...... 5 



actinoids 7 



Madreporians 16 



Halcyonoids 19 



General Sketch of Acalephs 21 



CTEN0PHOR.a! 26 



Embbyolooy of Ctenophor^ ...... 34 



DlSCOPHOB^ 37 



Hydroids 49 



Mode of Catching Jelly-Fishes 85 



echinoderms 91 



Holothurians *95 



echinoids 101 



Star-Fishes 108 



Ophiurans 115 



Crinoids 120 



Embryology of Echinodeems 123 



Distribution of Life in the Ocean 141 



Systematic Table 152 



Index 154 



