CONTENTS \ii 



CTENOPHOEA 



CHAPTER XV 



PAOE 



Ctenophora 412 



ECHINODERMATA 



CHAPTER XVI 



echinodermata introduction classification anatomy of a stail- 



fish Systematic Account of Asteroidea 427 



CHAPTER XVII 



ECHINODERMATA {CONTINUED) : OPHIUROIDEA = BRITTLE STARS . . . 477 



CHAPTER XVIII 



ECHINODERMATA (CO NTINUED) : ECHINOIDEA = SEA-URCHINS . . . . 503 



CHAPTER XIX 



ECHINODERMATA (CONTINUED) : HOLOTHUROIDEA = SEA-CUCUMBERS . . 560 



CHAPTER XX 



echinodermata (continued) : pelmatozoa crinoidea = sea - lllies 



Thecoidea Carpoidea Cystoidea Blastoidea .... 579 



CHAPTER XXI 



ECHINODERMATA (CONTINUED) : DEVELOPMENT AND PHYLOGENY . .601 



INDEX 





