CONTENTS 



CHAPTER I 



Introduction . 



PAGE 

 1 



Pbotozoa 



CHAPTER n 



CHAPTER m 



MbTAZOA PORIFEHA 



36 



CHAPTER IV 



COELENTBEATA 



47 



COELOMATA 



CHAPTER V 



CHAPTER VI 



Platyhelminthes 



80 



CHAPTER VII 



Nemertba 



115 



CHAPTER VIII 



Nbmatoda 



. 124 



CHAPTER IX 



HiRUDINEA 



131 



