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INTRODUCTION . xi 



Organisms divided into two Kingdoms .... xi 



Classification ; Species, Q-enus, Family, Order, Class, Branch, xii 



Animal Kingdom, Branches of xiii 



I. THE INVERTEBRATES. 



1. BRANCH PROTOZOA 



2. PORIFERA . 



3. CCELENTERATA 



4. ECHINODERMATA 



5. VERMES . 



6. MOLLUSCA . 



7. ARTHROPODA . 



1 

 8 



10 

 18 

 24 

 34 

 50 



II. THE VERTEBRATES. 



8. BRANCH VERTEBRATA . 

 The Tunicates 

 The Acrania . 

 The Cyclostoma . 

 The Elasmobranchii 

 The Ganoidei 



85 

 86 

 86 

 88 

 89 

 91 



R S (i 



