Tabular Survey of Classes. — {For Future Reference.) 



METAZOA CHORDATA. 



Mammalia. 



TEutheria. Placentals. "i 



J Metatheria. Marsupials. Non-pla- I 



j cental. j' 



\,Prototheria. Monotremes. Oviparous, j 



Carinatse. Keeled flying birds. 

 Ratitse. Keel-less running birds. 

 Extinct reptile-like birds. 



^Crocodilia. Crocodiles and alligators. 

 I Ophidia. Snakes. 

 ) Lacertilia. Lizards. 



\RhyncocephalIa. Sphc7iodon. 

 Chelonia. Tortoises and turtles. 

 Extinct Classes. 



{Anura. Tail-less frogs and toads. 

 Urodela. Tailed newts, 

 Gymnophiona, e.g., Ca'cilia. 

 Labyrinthodonts and other extinct 

 Amphibians. 

 /Dipnoi. Mud fishes. 

 Teleostei. Bony lishes. 

 j Ganoidei, e.g., .Siurgtion. 

 I Elasmobranchii. Cartilaginous fishes. 



(-■ .^ ^^^^ -' Haefish (My.vine), and Lamprey 



Cephai.ochordata. Aviphiox7is. 



Urochokdata. Tunicates. 



Hemichordata. Balanoglossus, Cephalodiscus. 



METAZOA NON-CHORDATA. 



Amphibia. 



Pisces. 



MOLLUSCA. 



Arthropoda. 



ECHINODEKMA. 



("Cephalopoda. Cuttle fishes. 

 -[ Gasteropoda. Snails. 

 \^Lamellibranchiata. Bivalves. 



/"Arachr.oidea. Spiders, scorpions, mites. 

 I Insecta. 



- Myriopoda. Centipedes and millipedes. 

 I Protracheata. Peripatus. 

 (^Crustacea. 



/"Crinoidea. Feather stars. (Cystoids and Blastoids, extinct.) 

 I Ophiuroidea. Brittle stars. 



- Asteroidea. Star fish. 



[^ 



-J Asteroi 

 I ICchino 

 iHoIoth 



noidea. Sea urchins. 

 LHoIothuroidea. Sea cucumbers. 



' j Chfetopoda. 

 ( Discophora. 



Hristle-footed worn' 

 Leeches. 



} Annelids. 



/'Brachiopoda. Lamp shells. 

 -? Polyzoa, e.g., Sea mat {Flustra). 

 vSipunculoidea, e.g., Siptinculiis. 



Nematoda. 

 Nemertea. 



Thread-worms. 

 Ribbon-worms. 



{'Cestoda. Tape-worms. 

 Trematoda. Flukes. 

 Turbellaria. Planarians. 



rPlathelminthes. 



CtELENTERA. 



POKIFERA. 



i Ctenophora, 

 { Scyphozoa. 

 l^ Hydrozoa. 



Sponges. 



e.g. , Beroe. 



Jellyfish and sea anemones. 

 Zoophytes and medusoids. 



PROTOZOA. 



Rhizoi'oda. Greg.'\rinida. 



Infusoria. 



Simplest forms of animal life, 



