CONTENTS xiii 



PAGE 



The brain . . . . . . . . . • 7' 



Reproduction ......... 72 



The phyla of the animal kingdom ..... 74 



Tabular view of the phyla ...... 75 



SECTION III 



Phylum Porifera . ....... 76 



Example of the Phylum and Class — Sycon gelatinosum . 76 



SECTION IV 



Phylum Ccelenterata .... 



Class 1. The Hydrozoa 



Example of the Class — Obelia . 

 Class 2. The Scyphozoa 



Example of the Class — Aurelia aurita 

 Class 3. The Actinozoa 



Example of the Class — Tealia crassicomu 

 Class 4. The Ctenophora .... 



Example of the Class — Hormiphora plumosa 



90 

 9i 

 91 



108 

 108 

 114 



114 

 125 



125 



SECTION V 



Phylum Platyhelminthes .... 

 Class 1. The Trematoda 



Example of the Class — Distomum hepaticum 

 Class 2. The Turbellaria 



Example of the Class — Planaria torva 

 Class 3. The Cestoda 



Example of the Class — Ttsnia solium 

 Class 4. The Nemertinea 



Example of the Class — Tetrastemma 



129 

 129 

 129 



'37 

 138 

 138 

 138 

 '45 

 '45 



SECTION VI 



Phylum Nemathelminthes .... 

 Class. The Nematoda .... 

 Example of the Class — Ascaris lumbricoides 



149 



149 

 149 



