308 ANIMAL LIFE 



BRANCH IV. PLATYHELMlN'THES 



CLASS I. Turbella'ria. 



Plana'ria. 



CLASS II. TrSmatS'da. 

 CLASS III. Costs' da. 



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

 APPENDIX TO PLATYHELMINTHES CLASS Nemertin ea. 



BRANCH V. NEMATHELMlN'THES 



CLASS I. NSmatS da. 



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

 worm, Unclna'ria. 

 CLASS II. Acanthoceph'ala. 

 CLASS III. Ohaetbg'natha (ke-t6g'-na-tha). 



BRANCH VI. TROCHELMlN'THES 



CLASS I. Rotif'era. 



Rotato'ria. 



CLASS II. Dlnophi lea. 

 CLASS III. Gastrbt'richa. 



BRANCH VII. M6LLU8COI'DA 



CLASS I. P51yz6 a. 

 CLASS II. FhorS'nida. 

 CLASS III. BrSchibp'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, Rhlzocrl'nus. 

 CLASS VI. Oystoi'dea. 

 CLASS VII. Blastoi dea. 



