TABLE OF CONTENTS 



An asterisk signifies that the group is extinct. 



PAGE 



THE CHORDATA .... 1 

 PHYtUM CEPHALOCHORDA . 10 



Phylum VERTEBRATA 



45 



Class I. PISCES .... 51 



Sub-class 1. Marsipobranchh 95 



„ 2. Elasmobranchh 118 



Order 1. Pleuropterygii* . 145 



„ 2. Acanthodii* . .146 



„ 3. Ichthyotoml* . . 147 



„ 4. Selachii (Plagio- 



stomi) . . .148 



Sub-order 1. Notidani . .149 



2. Squali . . 150 



3. Baji . . .153 

 Order 5. Holocephali . . 155 



Sub-class 3. Ganoidei . . 159 



Order 1. Chondrostei . .167 



Order 2. Crossopterygii . .171 



Sub-order 1. Ostedepida* . 175 



„ 2. Cladistia . .176 



Order 3. Lepidostei . . .176 



„ 4. Amioidei . . .180 



Sub-class 4. Teleostei 



183 



Sub-order 1. Malacopterygii 

 (Salmoniclwpei- 

 formcs) . . 213 



„ 2. Ostariophysi 

 {Cyprinisiluri- 

 forines] . .216 



Zl 



60275 



