308 ANIMAL LIFE 



BRANCH IV. PLATYHELMtN'THES 



CLASS I. Turbellaria. 



Planaria. 



CLASS II. Tremato da. 

 CLASS III. Cesto'da. 



Tape-worm, Tce'nia, Lig'ula, flat-worm. 

 APPENDIX TO PLATYHELMINTHES CLASS Nemertmea. 



BRANCH V. NEMATHELMlN'THES 



CLASS I. Nemato da. 



Syn'gamus, round-worm, Trtchi'na, Bdthrioceph' alus, pup- 

 worm, Uncina'ria. 

 CLASS II. Acanthoceph ala. 

 CLASS III. Chaetbgnatha (ke-tog'-na-tha). 



BRANCH VI. TROCHELMlN'THES 



CLASS I. Rotif era. 



Rotato'ria. 



CLASS II. Dinophi lea. 

 CLASS III. GastrSt richa. 



BRANCH VII. M6LLUSCOI'DA 



CLASS I. PSlyzo a. 

 CLASS II. PhorS'nida. 

 CLASS III. Brachiop oda. 



BRANCH VIII. ECHlNODER'MATA 



CLASS I. Asteroi dea. 



Starfish. 



CLASS II. Ophiuroi'dea. 

 CLASS III. Echinoi dea. 



Sea-urchin. 

 CLASS IV. HSlothuroi dea. 



Sea-cucumber. 

 CLASS V. Crinoi dea. 



Crinoid, Rhizocrl'nus. 

 CLASS VI. Cystoi dea. 

 CLASS VII. Blastoi dea. 



