XXIV 



OUTLINE OF CLASSIFICATION 



Subtype VII. Annelida. 

 Class I. Chcetopoda. 

 Subclass I. Polychaeta. 

 Subclass II. Oligochasta. 

 Class II. Gephyrea. 

 Class III. Hirudinea. 

 TYPE V. ARTHROPODA. 

 Subtype I. Crustacea. 

 Class I. Entomostraca. 

 Order i. Phyllopoda. 

 Order 2. Ostracoda. 

 Order 3. Copepoda. 

 Order 4. Cirripedia. 

 Class II. Malacostraca. 

 Subclass I. Leptostraca. 

 Subclass II. Arthrostraca. 

 Order 1. Isopoda. 

 Order 2. Amphipoda. 

 Subclass III. Thoracostraca. 

 Order 1. Cumacea. 

 Order 2. Stomatopoda. 

 Order 3. Schizopoda. 

 Order 4. Decapoda. 

 Supplementary order. Xipho- 

 sura. 

 Subtype II. Arachnida. 



Order 1. Scorpionida. 

 Order 2. Pseudoscorpionida. 

 Order 3. Pedipalpi. 

 Order 4. Solpugida. 

 Order 5. Phalangida. 

 Order 6. Araneida. 

 Order 7. Acarina. 

 Supplementary order 1. Lin- 



guatulida. 

 Supplementary order 2. Pyc- 



nogonida. 

 Supplementary order 3. Tar- 

 digrada. 

 Subtype III. Tracheata. 

 Class I. Protracheata. 

 Class II. Myrtapoda. 

 Order 1. Chilopoda. 

 Order 2. Diplopoda. 



Class III. Hexapoda or Insect 'a. .'■ 

 Order 1. Thysanura. 

 Order 2. Pseudoneuroptera. 

 Order 3. Orthoptera. 

 Order 4. Hemiptera. 

 Order 5. Xeiuoptera. 

 Order 6. Lepidoptera. 

 Order 7. Uiptera. 

 Order 8. Coleoptera. 

 Order 9. Hvmenoptera. 

 TYPE VI. MOLLUSCA. 

 Class I. Amphineura. 



Order 1. Solenogastres. 

 Order 2. Placophora. 

 Class II. Gastropoda. 



Order 1. Prosobranchia. 

 Order 2. Opisthobranchia. 

 Order 3. Pulmonata. 

 Class III. Scaphopoda. 

 Class IV. Lamellibranchia or 



Pelecypoda. 

 Class V. Ceplialopoda. 



Subclass I. Tetrabranchiata. 

 Subclass II. Uibranchiata. 

 Order 1. Decapoda. 

 Order 2. Octopoda. 

 TYPE VII. CHORD ATA. 

 Subtype I. Enteropneusta. 

 Subtype II. Tunicata. 

 Subtype III. Cephalochorda. 

 Subtype IV. Vertebrata. 

 Class I. Cyclostomata. 

 Class II. J '/sees. 



Subclass I. Elasmobranchii. 

 Order 1. Selachii. 

 Order 2. Holocephali. 

 Subclass II. Teleostomi. 

 Order r. Ganoidei. 

 Order 2. Teleo- 

 Subclass III. Dipnoi. 

 Class III. Amphibia. 

 Subclass I. Urodela. 

 Subclass II. Anura. 

 Subclass III. Gymnophiona. 



1 For extended classification of the Insecta see page 226. 



