376 APPENDIX. 
Sub-class 3. Discophora (‘‘ Jelly-fishes’’). Only known as fossils 
by impressions of their stranded carcasses. 
Sub-class 4. Lucernarida (*‘ Sea-blubbers”). Also only known 
as fossils by impressions left in fine-grained strata. 
Sub-class 5. Graptolitide * (*‘ Graptolites’’). 
CuLass II. ACTINOZOA. 
Order 1. Zoantharia. Ex. Sea-anemones** (Actinide), Star- 
corals (Astreide). 
Order 2. Alcyonaria. Ex. Sea-pens (Pennatula), Organ-pipe 
Coral (7udipfora), Red Coral (Corallium). 
Order 3. Rugosa (‘* Rugose Corals”’). 
n .4. Ctlenophora.** LEx. Venus’s Girdle (Cestum). 
SUB-KINGDOM III.—ANNULOIDA. 
Animals in which the digestive canal is completely shut off from the 
cavity of the body; a distinct nervous system; a system of branched 
‘* water-vessels,” which usually communicate with the exterior. Body of 
the adult often ‘‘radiate,”’ and never composed of a succession of definite 
rings. 
Cuiass I. ECHINODERMATA. 
Order 1. Crinoidea (‘‘ Sea-lilies”). 2x. Feather-star (Coma- 
tula), Stone-lily (Zucrinus*). 
Order 2. Blastoidea* (*‘ Pentremites’’). 
n 3. Cystotdea* (‘* Globe-lilies’’). 
n 4. Ophiuroidea (‘‘ Brittle-stars”). x. Sand-stars (Ophz- 
ura), Brittle-stars (Ofhzocoma). 
Order 5. Asteroidea (*‘ Star-fishes”’). £x. Cross-fish (Uvaster), 
Sun-star (.So/aster). 
Order 6. Echinoidea (‘‘Sea-urchins”). Lx. Sea-eggs (Echinus), 
Heart-urchins (Spatangus). 
Order 7. Holothuroidea (‘‘Sea-cucumbers”). x. Trepangs 
(Holothuria). 
Cuiass II. SCOLEcIDA ** (Intestinal Worms, Wheel Animalcules, &c.) 
SuUB-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. 
Crass I, GEPHYREA** (‘‘Spoon-worms”’). 
CuLass II, ANNELIDA (‘‘ Ringed-worms”). £2. Leeches** (Hirudinea), 
Earthworms** (Oligocheta), Tube-worms (7zdicola), Sea - worms 
and Sea-centipedes (Zrraztia). 
Cuiass III. CH2ZTOGNATHA** (‘‘ Arrow-worms”’), 
Division B. Arthropoda or Articulata. Limbs jointed to the body. 
Crass I. CRusTACEA (‘‘ Crustaceans’’), 4x. Bamacles and Acorn- 
shells (Civripedia), Water- fleas (Ostracoda), Brine -shrimps and 
Fairy-shrimps (Phyllofoda), Trilobites * (Z7ilodita), King - crabs 
and Eurypterids* (JZerostomata), Wood-lice and Slaters (/sofoda), 
Sand-hoppers (Amphipoda), Lobsters, Shrimps, Hermit-crabs, and 
Crabs (Decapoda). 
