TABLE OF CONTENTS ix 



Page 



Class III. Anthozoa 224 



Order I. Tetracoralla 230 



Order II. Octocoralla 230 



Order III. Hexacoralla 230 



Class IV. Ctenophora 232 



Summary 235 



Vermes 237 



Phylum IV. Plathelminthes 23S 



Class I. Turbellaria 240 



Class II. Trematoda 242 



Order I. Polystomite 244 



Order II. Distomiae 245 



Class III. Cestoda 247 



Class IV. Nemertini 2 5 ^ 



Summary 258 



Phylum V. ROTIFEEA 259 



Phylum VI. Coilhelminthes 260 



Class I. Chstognathi 262 



Class II. Nenrathelminthes 263 



Order I. Nematoda 2 63 



Order II. Gordiacea 268 



Order III. Acanthocephala 268 



Class III. Annelida 269 



Sub Class I. Cha;topoda 270 



Order I. Polychaste 276 



Order II. Oligochjetaa 278 



Sub Class II. Gephyrsa 279 



Order I. Chastiferi 281 



Order II. Inermes 281 



Order III. Priapuloidea 281 



Sub Class III. Hirudinei 281 



Class IV. Polyzoa 284 



Class V. Phoronida 287 



Class VI. Brachiopoda 287 



Summary 290 



Phylum VII. Echinodeema 291 



Class I. Asteroidea 295 



Class II. Ophiuroidea 298 



Class III. Crinoidea 299 



Sub Class I. Eucrinoidea 302 



Sub Class II. Edrioasteroidea 302 



Sub Class III. Cystidea 303 



Sub Class IV. Blastoidea 303 



Class IV. Echinoidea 303 



Class V. Holothuroidea 306 



Summary 30S 



Phylum VIII. Mollusca 31° 



Class I. Amphineura S^S 



Class II. Acephala 317 



Order I. Protoconchia; 323 



Order II. HeteroconchiEe 324 



