CONTENTS 



Other Hydrozoa 303 

 THE CLASS SCYPHOMEDUSAE 304 

 THE CLASS ANTHOZOA 307 

 THE COELENTERATE BODY PLAN 310 

 THE PHYLUM CTENOPHORA 310 

 Representative Types 



RADIATA AND BILATERIA 312 



11 THE FLATWORMS: PHYLA PLATYHELMINTHES AND NEMERTINEA 314 



THE PHYLUM PLATYHELMINTHES 314 

 THE CLASS TURBELLARL\ 3 1 5 



Fresh- Water Planarians 317 



Other Turbellaria 324 

 THE CLASS TREMATODA 328 



Monogenea 328 

 Digenea 329 



THE CLASS CESTODA 332 



The Subclass Ccstodaria 333 



The Subclass pAicestoda 333 

 THE PHYLUM NEMERTINEA 340 

 THE FLATWORM BODY PLAN 343 



12 SOME PSEUDOCOELOMATE ANIMALS AND MINOR 



EUCOELOMATE PHYLA 344 



PSEUDOCOELOMATE GROUPS 345 



THE PHYLUM ASCHELMINTHES 345 

 The Class Rotifcra 345 

 The Class Nematoda 348 

 THE ASCHELMINTH BODY PLAN 354 

 OTHER PSEUDOCOELOMATE PHYLA 354 

 The Phvlum Acanthocephala 354 

 The Phylum Kntoprocta 356 

 MINOR EUCOELOMATE PHYLA 357 



THE PHYLUM ECTOPROCTA 357 

 THE PHYLUM BRACHIOPODA 361 

 THE PHYLUM CHAETOGNATHA 365 

 SUMMARY 366 



13 THE PHYLUM MOLLUSCA 368 



SCHIZOCOELA AND ENTEROCOELA 368 

 THE PHYLUM MOLLUSCA 369 



THE CLASS PELECYPODA 370 



The Clam or F"resh-VValer Mussel 370 

 Other Pelecvpoda 379 



THE CLASS AMPHINEURA 381 



