APPENDIX 



945 



REFERENCE TABLE OF THE PRINCIPAL GROUPS OF ANIMALS' 



PROTOZOA (the 

 simplest animals) 



COELENTERATA j Porifera 

 (Sponges, corals, \ 



jellyfishes) ! Cnidaria 



JPelmatozoa 

 A 4. 



fishes, sea-urchins) | A ^rozoa 

 Echinozoa 



VERMES (Worms) 



MOLLUSCOIDEA 



(Mollusc-like forms) 



MOLLUSCA 



(Molluscs) 



I 



ARTHROPODA 



(The articulates) 



Branchiata 



Tracheata 



VERTEBRATA 



Rhizopoda 



Flagellata 



Infusoria 



Gregarina 



Spongiaj 



Foraminifera. 

 Radiolaria. 



f Unknown in 

 f fossil state. 



j Calcareous sponges. 

 | Silicious sponges. 

 ( Anthozoa, coral polyps. 

 ( Hydrozoa, hydroids and medusae. 

 ( Cystoidea, cystids. 

 j Crinoidea, stone lilies. 

 ( Blastoidea, blastids. 



Ophiuroidea, brittle-stars. 



Asteroidea, starfishes. 



Echinoidea, sea-urchins. 



Holothuroidea, sea-cucumbers, 

 f Platyhelminthes i 



\ Netathelminthes } Rare as fossils, 



Gephyrea 



(^Annelida, sea- worms. 

 ( Bryozoa, sea-mosses. 

 ( Brachiopoda, lamp-shells. 



Pelecypoda, lamellibranchs,bivalves. 



Scaphopoda, tusk-shells. 



Amphineura, chiton. 



Gastropoda, univalves, snails, etc. 



Cephalopoda, nautilus, cuttlefish. 



Crustacea. 



Trilobita, trilobites. 



Gigantostraca, horseshoe crabs. 



Entomostraca, ostracoids, barnacles 



Malacostraca, lobsters, crabs. 



Myriapoda, centipedes. 



Arachnoidea, spiders, scorpions. 



Insecta, insects. 



Cyclostomata, lampreys, 

 f Selachii, sharks. 



p- _ pc | Holocephali, spook-fishes. 

 ' S s<j Dipnoi, lung-fishes. 



I Teleostomi, ganoids and 

 [_ teleosts, (common fishes). 



Amphibia, amphibians, batrachians. 

 j Reptilia, reptiles. 

 I Aves, birds. 



fPrototheria, mono- 

 Mammalia J i**/ 6 ?? 68 *. 



(mammals) j Metethena, marsupi- 



(^Eutheria, placentals. 



After Zittel in the main. 



