vi CONTENTS 



CHAPTER IV 



MESOZOA 



PAGE 



Dicyemidae Structure Reproduction Occurrence : Orthonectidae 



Occurrence Structure : Trichoplax: Salinella ... 92 



NEMEKTINEA 



CHAPTER V 



nemertinea 



Introductory External Characters Anatomy Classification- 

 Development Habits Regeneration Breeding Geographical 

 Distribution Land, Fresh - Water, and Parasitic Forms 

 Affinities ' . . . . .99 



NEMATHELMINTHES AND CHAETOGNATHA 



CHAPTER VI 



nemathelminthes 



Introduction Nematoda Anatomy Embryology Classification 

 Ascaridae Strongylidae Trichotrachelidae Filariidae 

 Mermithidae Anguillulidae Enoplidae Parasitism : Nemato- 

 morpha Anatomy Classification Life - History : Acantho- 

 cephala Anatomy Embryology Classification . . . .123 



CHAPTER VII 



chaetognatha 



Structure Reproduction Habits Food Classification- Table of 



Identification [see also p. 534] . 186 



KOTIFEKA, GASTKOTKICHA, AND KINOEHYNCHA 



CHAPTER VIII 



ROTIFERA, gastrotricha, and kinorhyncha 



Rotifera History External Features Movements Anatomy Re- 

 production Embryology Classification Distribution Affini- 

 ties : Gastrotricha: Kinorhyncha 197 



