TABULAR SURVEY OF CHIEF CLASSES. 



METAZOA NON-CHORDATA 



MOLLUSCA. 



Cephalopoda. Cuttle-fishes. 



Gasteropoda. Snails. 



Lamellibranchiata. Bivalves. 



Two smaller classes : Scaphopoda and Solenogastres 



{Arachnoidea. Spiders, scorpions, mites 

 Insecta. 

 Myriopoda. Centipedes and millipedes. 

 Prototracheata. Peripatus. 

 Crustacea 

 Palaeostraca : Trilobites, Eurypterids, and King-crabs. 

 Some smaller classes. 



/ Crinpidea. Feather- stars. (Cystoids and Blastoids, extinct.) 

 I Ophiuroidea. Brittle-stars. 

 ECHINODERMA. \ Asteroidea. Star-fishes. 

 I Echinoidea. Sea-urchins. 

 vHolothuroidea. Sea-cucumbers. 



WORMS." 



Chsetopoda. Bristle worms. 

 Discophora. Leeches. 

 Some smaller classes. 



} Annelids or 

 Annulata 



f Brachiopoda. Lamp-shells. 



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



iSipunculoidea, eg. Sipuncuhis. 



Nematoda. Thread-worms. 

 Acanthocephala. 

 Nemertea. Ribbon-worms. 

 Rotifera. Wheel-animalcules. 



{Cest 

 Tre 

 Tur 



Cestoda. Tape-worms. 

 matoda. Flukes. 

 bellaria. Planarians. 



") 



\ Pl 

 J 



latyhelminthes. 



Ctenophora, e.g. Beroe. 



Actinozoa or Anthozoa. Sea-anemones. Alcyonaiians and re 

 CCELENTERA. \ lated corals. 



Scyphomedusae or Acraspeda. Jelly-fishes, 

 Hydrozqa. Zoophytes and medusoids. 



FOR i PER A. Sponges. Calcareous and non-calcareous 



PROTOZOA 



INFUSORIA. RHIZOPODA. SPOROZOA. 

 Simplest forms of animal life. 



