CONTENTS. 



CHAPTER XIII. 



CCELENTERATA, 



Hydra 



Obelia 



Actinia 



Alcyonium 



Amelia 



Cydippe ... 



The Ccelenlerala . 



CHAPTER XIV. 



PLATYHELMINTHES, NEMATHELMINTHES 

 AND ROT I FEE A, 



Dislomum 



Tcenia 



The Platyhelminthes 



Hydatina ... 



The Rotifera 



Ascaris 



The Nemathelminther> ... 



CHAPTER XV. 

 ARCHIC(ELOMA TA. 



Asterias ... 



Balanoglossus 



Lophopus ... 



Sagitta 



Waldheimia 



The Archicoelomata 



CHAPTER XVI. 

 ANNULATA. 



Polygordius 

 Arenicola ... 

 Hirudo 

 Lumbricus 



179 



181 

 190 

 198 



