("Ringed-worms"). _Ex_. Leeches**
(_Hirudinea_), Earthworms** (_Oligochoeta_),
Tube-worms (_Tubicola_), Sea-worms and
Sea-centipedes (_Errantia_).
CLASS III. CHAETOGNATHA** ("Arrow-worms").
_Division B. Arthropoda or Articulata_. Limbs jointed to the body.
CLASS I. CRUSTACEA ("Crustaceans"). _Ex_. Barnacles and
Acorn-shells (_Cirripedia_), Water-fleas (_Ostracoda_),
Brine-shrimps and Fairy-shrimps (_Phyllopoda_), Trilobites*
(_Trilobita_), King-crabs and Eurypterids* (_Merostomata_),
Wood-lice and Slaters (_Isopoda_), Sand-hoppers
(_Amphipoda_), Lobsters, Shrimps, Hermit-crabs, and
Crabs (_Decapoda_).
CLASS II. ARACHNIDA. _Ex._ Mites (_Acarina_), Scorpions
(_Pedipalpi_), Spiders (_Araneida_).
CLASS III. MYRIAPODA. _Ex._ Centipedes (_Chilopoda_),
Millipedes and Galley-worms (_Chilignatha_).
CLASS IV. INSECTA ("Insects"). _Ex_. Field-bugs (_Hemiptera_);
Crickets, Grasshoppers, &c. (_Orthoptera_); Dragon-flies
and May-flies (_Neuroptera_); Goats and House-flies
(_Diptera_); Butterflies and Moths (_Lepidoptera_);
Bees, Wasps, and Ants (_Hymenoptera_); Beetles
(_Coleoptera_).
SUB-KINGDOM V.--MOLLUSCA.
Animal soft-bodied, generally with a hard covering or shell; no
distinct segmentation of the body; nervous system of scattered
masses.
CLASS I. POLYZOA ("Sea-Mosses"). _Ex_.
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