266 ESSENTIALS OF ZOOLOGY 



Phylum XI. Chordata (Man, Etc.) 



Suljphylum I. Enteropneusta (Hemicliorda) 



Order 1. Balanoglossida — Dolichoglossus 

 Order 2. Cephalodiscida — (None in America) 



Sutophylum II. Tunicata (Urochorda) 



Order 1. Ascidiacea — Molgula 

 Order 2. Thaliacea — Salpa 

 Order 3. Larvacea — Oikopleura 



Subphylum III. Cephalocliorda 

 Subphylum IV. Vertebrata 



Class I. Cyclostomata 



Subclass A. Myxinoidea — Myxine 

 Subclass B. Petromyzontia — Entosphenus 



Class II. Elasmobranchii 



Subclass A. Selachii 



Order 1. Euselacliii — Car char odon 



Order 2. Cyclospondyli — Squalus 



Order 3. Batoidea (Kaji) — Kaja 

 Subclass B. Holocepliali — Chimaera 



Class III. Pisces 



Subclass A. Teleostomi 



Order 1. Crossopterygii — Polypterus 



Order 2. Chondrostei — Polydon 



Order 3. Holostei — Lepidosteus 



Order 4. Teleostei — Ameiurus 

 Subclass B. Dipnoi — Protopterus 



Class IV. Amphibia 



Order 1. Caudata (Urodela) — Necturus 

 Order 2. Salientia (Anura) — Bana 

 Order 3. Apoda — Ichthyophis 



Class V. Reptilia 



Order 1. Testudinata — Pseudemys 



Order 2. Rhynchocephalia — Sphenodon 



Order 3. Crocodilia — Alligator 



Order 4. Squamata — Phrynosoma 



Class VI. Aves 



Subclass A. Archaeornitlies (Extinct) — Archaeornis 



Subclass B. Neornithes 

 Order 1. Hesperornithiformes (Extinct) — Hesperornis 

 Order 2. Ichtliyornithiformes — Ichthyornis 

 Order 3. Strutliioniformes — Struthio 

 Order 4. Rheiformes — Bhea 

 Order 5. Casuariiformes — Casuarius 

 Order 6. Crypturiformes — Tinamus 

 Order 7. Dinornithiformes (Extinct) — Palapteryx 

 Order 8. Aepyornithiformes (Extinct) — Aepyornis 

 Order 9. Apterygiformes — Apteryx 

 Order 10. Sphenisciformes — Spheniscus 

 Order 11. Colymbiformes — Gavia 

 Order 12. Procellariiformes — Diomedea 

 Order 13. Ciconiiformes — Botaurus 

 Order 14. Anseriformes — Anas 



