3/6 APPENDIX. 



Stib-class 3. Discophora ("Jelly-fishes "). Only known as fos^us 

 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. Graplolitid(z * (" Graptolitej "). 

 CLASS II. ACTINOZOA. 



Order I. Zoantharla. Ex. Sea-anemones** (Actinidiz), Star- 

 corals (Astrceida;}. 



Order 2. Alcyonaria. Ex. Sea-pens (Pcnnatula), Organ-pipe 

 Coral (Tubipord), Red Coral (Corallium). 



Order 3. Rugosa (" Rugose Corals"). 



ii 4. Ctenophora** Ex. Venus's Girdle (Cestuni). 



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. 

 CLASS I. ECHINODERMATA. 



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

 tula], Stone-lily (Encrinus *). 

 Order 2. Blastoidm* (" Pentremites "). 

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



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

 urd), Brittle-stars (Ophiocomd). 

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



Sun-star (Solaster). 

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



Heart-urchins (Spatangiis). 

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



(Holothuria). 

 CLASS II. Scoi.EClDA ** (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** (Oligochizta), Tube-worms (7'ubicola) t Sea -worms 



and Sea-centipedes (Errantia). 

 CLASS III. CH^TOGNATHA ** ("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 (Pkyllopoda), Trilobites * (7^rilebita}, King-crabs 

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

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

 Crabs (Decapoda). 



