CONTENTS. 



Page 



On "Radiates in general ....... 1 



General Sketch of the Polyps ...... 5 



ACTINOIDS *l 



Madreporians ......... 16 



Halcyonoids .......... 19 



General Sketch of Acalephs ...... 21 



CTENOPHORiE .......... 26 



Embryology of Ctenophor^e ...... 34 



DiscoPHOR^ 3Y 



Hydroids' .......... 49 



Mode of Catching Jelly-Fishes ...... 85 



echinoderms 91 



Holothurians .......... 95 



echinoids .......... 101 



Star-Pishes 108 



Ophiurans 115 



Crinoids 120 



Embryology of Echinoderms 123 



Distribution of Life in the Ocean 141 



Systematic Table ........ 152 



Index 154 



