CONTENTS 



Nematoda 



Ascaridae page 543 



Heterakidae 55° 



Trichostrongylidae 55° 



Philometridae 55° 



Spiruridae 55° 



Cucullanidae 553 



ACANTHOCEPHALA 



Echinorhynchidae 555 



Rhadinorhynchidae 557 



