CONTENTS 



CLASS I. PISCES . 



Sub-Class 1. Selachii . 



Order 1. Pleuropterygii 

 ,, 2. acanthodii 

 ,, 3. ichthyotomi 

 „ 4. Plagiostomi 

 ,, 5. holocephali 



Sub-Class 2. Ostracodermi 



Urdki{ 1. Heterostraci 

 „ 2. axaspida 

 ,, 3. aspidocephali 

 „ 4. Antiarcha 



Sub- Class 3. Arthrodira 



Sub-Class 4. Dipnoi 



Order 1. Ctenodipterini 

 ,, 2. Sirenoidei 



Sub-Class 5. Ganoidei . 



Order 1. Crossopterygii 

 „ 2. Chondrostei 

 ,, 3. Heterocerci 

 „ 4. Lepidostei 

 „ 5. Amioidei 



Sub-Class 6. Teleostei . 



Order 1. Physostomi 

 „ 2. Physoclysti 



CLASS IL AMPHIBIA 



Order 1. Stegocephalia 

 ,, 2. Gymnophiona 

 ,, 3. Urodela 

 „ 4. Anura 



