APPENDIX 



THE CLASSIFICATION OF ANIMALS 



The systems of classification in most general use at the pres- 

 ent time are usually modifications of that of Carl Claus, which 

 appeared in his "Textbook of Zoology." Claus divided the 

 animal kingdom into nine subkingdoms, which, with their main 

 subdivisions, as given in the fourth edition (1887) of his work, 

 are the following: 



I. Protozoa 



Rhizopoda 

 Infusoria 

 II. Coelenterata 



Spongiaria 

 Cnidaria 

 Anthozoa 

 Polypomedusse 

 Ctenophora 



III. Echinodermata 



Crinoidea 



Asteroidea 



Echinoidea 



Holothuroidea 



Enteropneusta 



IV. Vermes 



Platyhelminthes 

 Nemathelminthes 

 Annelides 

 Rotatoria 

 V. Arthropoda 

 Crustacea 

 Arachnoidea 



Onychophora 



Myriopoda 



Hexapoda 



VI. Mollusca 



Solenogastres 



Lamellibranchiata 



Scaphopoda 



Gastropoda 



Cephalopoda 



VII. Molluscoidea 

 Bryozoa 

 Brachiopoda 



VIII. Tunicata 



Tethyodea 

 Thaliacea 



IX. Vertebrata 

 Pisces 

 Amphibia 

 Reptilia 

 Aves 

 Mammalia 



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