TABULAR SURVEY OF CLASSES. (For Future Reference.} 



METAZOA CHORDATA. 



MAMMALIA. 



AVES. 



REPTILIA. 



AMPHIBIA. 



PISCES. 



Eutheria. Placentals. 



Metatheria. Marsupials. Non-pla- 



cental. 

 Prototheria. Monotremes. Oviparous. 



{Carinatae. Keeled flying birds. 

 Ratitae. Keel-less running birds. 

 Extinct reptile-like birds. 



,-Crocodilia. Crocodiles and alligators. 

 I Ophidia. Snakes. 

 J Lacertilia. Lizards. 

 I Rhyncocephalia. Sphenodon. 

 I Chelonia. Tortoises and turtles. 

 ^Extinct Classes. 



f Anura. Tail-less frogs and toads. 

 I Urodela. Tailed newts. 

 < Gymnophiona, e.g., C&cilia. 

 I Labyrinthpdpnts and other extinct 

 V Amphibians. 



Dipnoi. Mud fishes. 



Teleostei. Bony fishes. 



Ganoidei, e.g., Sturgeon. 



Elasmobranchii. Cartilaginous fishes.; 



), and Lamprey 



if 

 II 



/Hagfish (Myxine), 

 " I (Petromyzon). 



CYCLOSTOMATA. ~\ 



CEPHAI.OCHORDATA. A mphioxus. 



UROCHORDATA. Tunicates. 



HEMICHORDATA. Balanoglossus, Cephalodiscus. 



METAZOA NON-CHORDATA. 



MOLLUSCA. 



T Cephalopoda. Cuttle fishes. 

 -f Gasteropoda. Snails. 

 ^Lamellibranchiata. Bivalves. 



TArachnoidea. Spiders, scorpions, mites. 

 J Insecta. 



ARTHROPODA. -; Myriopoda. Centipedes and millipedes. 

 I Protracheata. Peripatus. 

 ^Crustacea. 



TCrinoidea. Feather stars. (Cystoids and Blastoids, extinct.) 

 I Ophiuroidea. Brittle stars. 

 \ Asteroidea. St?- ^ oVl 

 I F.chinoidea. Se 

 v Holothuroidea. 



ECHINODERMA. \ Asteroidea. 



Star fish. 

 Sea urchins. 



Sea cucumbers. 



" J Chaetopoda. 

 1 Discophora. 



' WORMS." 



CCELENTERA. 



PORIFERA. 



Bristle-footed worms. 

 Leeches. 



Annelids. 



f Brachiopoda. Lamp shells. 

 -| Pplyzoa, e.g., Sea mat (Flustra). 

 V.Sipunculoidea, e.g. , Sipunculus. 



Nematoda. 

 Nemertea. 



Thread-worms. 

 Ribbon -worms. 



{Cestoda. Tape-worms. ^ 

 Trematoda. Flukes. VPlathelmin 



Turbellaria. Planarians. J 



( Ctenophora, e.g. , Beroe. 



\ Scyphozoa. Jellyfish and sea anemones. 



VHydrozoa. Zoophytes and medusoids. 



Sponges. 



PROTOZOA. 



INFUSORIA. RHIZOPODA. GREGARINIDA. 

 Simplest forms of animal life. 



thes. 



