3/6 APPENDIX. 



Sub-class 3. Discophora ("Jelly-fishes"). Only known as fossils 

 by impressions of their stranded carcasses. 



Sub-class 4. Lucerncirida ("Sea-blubbers"). Also only known 

 as fossils by impressions left in fine-grained strata. 



Sub-class 5. Graptolituice* (" Graptolites "). 

 CLASS II. ACTINOZOA. 



Order I. Zoantharia. Ex. Sea-anemones** (Actinida), Star- 

 corals (Astrczida:), 



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

 Coral (Tubipord), Red Coral (Corallium). 



Order 3. Rugosa (" Rugose Corals"). 



.. 4. Ctenophora** Ex. Venus's Girdle (Cesium}. 



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"). 



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

 ura), Brittle-stars (Ophiocoma). 

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



Sun-star (Solaster). 

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



Heart-urchins (Spatangus). 

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



(Holothuria). 

 CLASS II. SCOI.ECIDA ** (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** (ffirudinea), 



Earthworms** (Oligocha:ta\ Tube-worms (Tubicola), Sea -worms 



and Sea-centipedes (Errantid). 

 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 (PhyllopoJa), Trilobites * (Trilobita), King-crabs 

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

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

 Crabs (Decapodd). 



