CONTENTS 



PAGE 



ON RADIATES IN GENERAL . . . . . . . 1 



GENERAL SKETCH OF THE POLYPS ...... 5 



ACTINOIDS .......... 7 



MADREPORIANS ......... 16 



HALCYONOIDS . . . . . . . . . .19 



GENERAL SKETCH OF ACALEPHS 21 



CTENOPHOR^: .......... 26 



EMBRYOLOGY OF CTENOPHOR.E ...... 34 



DISCOPHOR.E .......... 37 



HYDROIDS .......... 49 



MODE OF CATCHING JELLY-FISHES ...... 85 



ECHINODERMS ......... 91 



HOLOTHURIANS . . . . . . . . .95 



ECHINOIDS 101 



STAR-FISHES 108 



OPHIURANS ... 115 



CRINOIDS 120 



EMBRYOLOGY OF ECHINODERMS . . . . . . 123 



DISTRIBUTION OF LIFE IN THE OCEAN ..... 141 



SYSTEMATIC TABLE . 152 



INDEX 154 



