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. GraplolitidfZ* (" Graptolite^. "). 

 CLASS II. ACTINOZOA. 



Order i. Zoantharia. Ex. Sea-anemones** (Actinidcz}, Star- 

 corals (Astneida;}. 



Order 2. Alcyonaria. Ex. Sea-pens (Pennatula\ Organ-pipe 

 Coral \Tubipora} % Red Coral (Corallium). 



Order 3. Riigosa (" Rugose Corals"). 



ii 4. Ctenophora.** Ex. Venus's Girdle {Cesium}. 



SUB- KING DOM 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. 



CLASS I. ECHINODERMATA. 



Order i. Crinoidea ("Sea-lilies"). Ex. Feather star Coma- 

 tula), Stone-lily (Encrinus*). 

 Order 2. Blastoidea* (" Pentremites "). 



3. Cystoidea* ("Globe-lilies"). 



it 4. Ophiuroidea (" Brittle-stars"). Ex. Sand-stars (Ophi- 



ura\ Brittle-stars (Ophiocoma). 

 Order 5. Asteroidea ("Star-fishes"). Ex. Cross-fish (Uraster), 



Sun-star (Solasftr). 

 Order 6. Echinoidea ("Sea-urchins"). Ex. Sea-eggs (Echinus'], 



Heart-urchins (Spatang/is). 

 Order 7. Holothuroidea (" Sea- cucumbers "). Ex. Trepangs 



(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** (Hirudinca), 



Earthworms** (Oligochccta\ Tube-worms (7'tibicola), Sea -worms 



and Sea-centipedes (Errantia). 

 CLASS III. CH^ETOGNATHA** ("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 (Phyllopodd), Trilobites * (Trilobitd), King-crabs 

 and Eurypterids * (Merostomata), Wood-lice and Slaters (Isopoda), 

 Sand-hoppers (Amphipoda], Lobsters, Shrimps, Hermit-crabs, and 

 Crabs (Decapodn}. 



