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APPENDIX 



REFERENCE TABLE OF THE PRINCIPAL GROUPS OF ANIMALS 1 



PROTOZOA (the 

 simplest animals) 



VERMES (Worms) 



MOLLUSCOIDEA 



(Mollusc-like forms) 



MOLLUSCA 

 (Molluscs) 



ARTHROPODA 

 (The articulates) 



Branchiata 



Tracheata 



VERTEBRATA 



1 After Zittel in the main. 



Rhizopoda 



Flagellata 



Infusoria 



Gregarina 



Spongias 



! Foraminifera. 

 \ Radiolaria. 



I Unknown in 

 ( fossil state. 



/ Calcareous sponges. 

 \ Siliceous sponges. 



Anthozoa, coral polyps. 



Hydrozoa, hydroids and medusae. 



Cystoidea, cystids. 



Crinoidea, stone lilies. 



Blastoidea, blastoids. 



Ophiuroidea, brittle-stars. 



Asteroidea, starfishes. 



Echinoidea, sea-urchins. 



Holothuroidea, sea-cucumbers. 



Platyhelminthes ] 



Rotifera ( Rare as fossils. 



Nemathelminthes j 



Gephyrea 



Annelida, sea-worms. 



Bryozoa, sea-mosses. 



Brachiopoda, lamp-shells. 



Pelecypoda, lamellibranches, bivalves, 



Scaphopoda, tusk-shells. 

 | Amphineura, chiton. 



Gastropoda, univalves, snails, etc. 

 I Cephalopoda, nautilus, cuttlefish. 

 | Crustacea. 



Trilobita, trilobites. 

 ] Gigantostraca, horseshoe crabs. 

 I Entomostraca, ostracoids, barnacles. 

 I Malacostraca, lobsters, crabs. 

 | Myriapoda, centipedes. 

 | Arachnoidea, spiders, scorpions. 

 ( Insecta, insects. 



Cyclostomata, lampreys. 



( Selachii, sharks, 

 j Holocephali, spook-fishes. 

 Dipnoi, lung-fishes. 

 Teleostomi, ganoids and 

 teleosts (common fishes). 



Amphibia, amphibians, batrachians. 



Reptilia, reptiles. 



Aves, birds. 



,. f Prototheria, monotremes. 



Mammalia Metatheria marsu pi a l s . 



(mammals) v,^ n1rv 



Pisces 

 (fishes) 



[ Eutheria, placentals. 



