INTRODUCTION 19 



Order 7. Mallophaga. 



Order 8. Thysanoptera. 



Order 9. Euplexoptera. 

 Order 10. Orthoptera. 

 Order 11. Hemiptera. 

 Order 12. Neuroptera. 

 Order 13. Mecoptera. 

 Order I4. Trichoptera. 

 Order 15. Lepidoptera. 

 Order 16. Diptera. 

 Order 17. Siphonaptera. 

 Order 18. Coleoptera. 

 Order 19. Hymenoptera. 



Class V. Arachnida. 



Other Classes. 



Pycnogonida. 

 Tardigrada, 



PHYLUM CHORDATA. 



Sub-phylum Hemichorda (Enteropneusta). 

 Sub-phylum Urochorda (Tunicata). 

 Sub-phylum Cephalochorda (Adelochorda or Acrania). 

 Sub-phylum Vertebrata or Craniata. 



Class I. Cyclostomata, 



Class II. Pisces. 



Sub-class Elasmobranchii. 

 Sub-class Teleostomi. 



Order i. Crossopterygii. 



Order 2. Chondrostei. 



Order 3. Holostei. 



Order 4. Teleostei. 

 Sub-class Dipnoi. 



Class III. Amphibia. 



Order i. Apoda or Coecilians. 

 Order 2. Urodela or Caudata. 

 Order 3. Anura (Salientia or Ecaudata). 



Class IV. Reptilia. 



Super-order i. Cotylosauria. 



Super-order 2. Chelonia. 



Super-order 3. Therapsida (Theromorpha). 



Super-order 4. Sauropterygia. 



Super-order 5. Ichthyopterygia. 



Super-order 6. Archosauria. 



Class V. Aves. 



Division A. Ratitae. 

 Division B. Carinatae. 



Order i. Pygopodes. 



Order 2. Longipennes. 



Order 3. Tubinares. 



