(_Holothuria_).
CLASS II. SCOLECIDA** (Intestinal Worms, Wheel Animalcules, &c.)

SUB-KINGDOM IV.--ANNULOSA.

Animal composed of numerous definite segments placed one behind
the other; nervous system forming a knotted cord placed along
the lower (ventral) surface of the body.

_Division A. Anarthropoda_. No jointed limbs.

CLASS I. GEPHYREA** ("Spoon-worms").
CLASS II. ANNELIDA. ("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_. Sea-mats (_Flustra_),
Lace-corals (_Fenestellidoe_*).
CLASS II. TUNICATA** ("Tunicaries"). _Ex_. Sea-squirts
(_Ascidia_).
CLASS III. BRACHIOPODA ("Lamp-shells"). _Ex_. Goose-bill
Lamp-shell (_Lingula_).
CLASS IV. LAMELLIBRANCHIATA ("Bivalves"). _Ex_. Oyster
(_Ostrea_), Mussel (_Mytilus_), Scallop (_Pecten_),
Cockle (_Cardium_).
CLASS V. GASTEROPODA ("Univalves"). _Ex_. Whelks
(_Buccinum_), Limpets (_Patella_), Sea-slugs**
(_Doris_), Land-snails (_Helix_).
CLASS VI. PTEROPODA ("Winged Snails"). Ex. _Hyalea, Cleodora_.
CLASS VII. CEPHALOPODA ("Cuttle-fishes"). _Ex_. Calamary
(_Loligo_), Poulpe (_Octopus_), Paper Nautilus
(_Arganauta_), Pearly Nautilus (_Nautilus_), Belemnites,*
Orthoceratites,* Ammonites.*