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 .................. 2 35 



VERMES .................. -237 



Phylum IV. PLATHELMINTHES . . . 238 



Class I. Turbellaria ............. . 240 



Class II. Trematoda .......... 242 



Order I. Polystomiae ...... 244 



Order II. Distorrme ....... - 245 



Class III. Cestoda ........ .247 



Class IV. Nemertini ............. 2 55 



SUMMARY .................... -258 



Phylum V. ROTIFERA .................. 259 



Phvllim VI. CCELHELMINTHES ............ ................................ 260 



Class I. Chastognalhi .......... ................. 262 



Class II. Nemathelminthes ........................... . 263 



Order I. Nematoda ................... .263 



Order II. Gordiacea ............... . 268 



Order III. Acanthocephala ......... . 268 



Class III. Annelida ......... .269 



Sub Class I. Chaetopoda. . . .270 



Order I. Polychastae .......... .276 



Order II. OligochaetEe ..... ........ 278 



Sub Class II. Gephyraa. . . .279 



Order I. Chaniferi ....... . 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 ........................ 2 9 



Phylum VII. ECHINODERMA ...................... 291 



Class I. Asteroidea ........... 295 



Class II. Ophiuroidea ................. 298 



Class III. Crinoidea ............ .299 



Sub Class I. Eucrinoidea ................ 3 2 



Sub Class II. Edrioasteroidea .......... . 3 2 



Sub Class III. Cystidea ............. 33 



Sub Class IV. Blastoidea .......... 33 



Class IV. Echinoidea ................ 33 



Class V. Holothuroidea .......... 3 6 



SUMMARY ................................ 



Phylum. VIII. MOLLUSCA ................. 3 IQ 



Class I. Amphineura .................. 3 T 5 



Class II. Acephala ................... 3 J 7 



Order I. Protoconchise .......................... 3 2 3 



Order II. Heteroconchia? ........................................ 3 2 4 



