vi Contents 



CHAPTER PAGE 



V. BRANCH ECHINODERMATA : The Starfishes and 



Sea-urchins 35 



The Starfish 35 



The Sea-urchin .40 



The Sea-cucumber 42 



The Classification of the Echinodermata ... 44 



VI. BRANCH ANNULATA: The True Worms . . 46 



The Earthworm 46 



The Marine Annelid 49 



The Classification of the Annulata .... 52 



VII. BRANCH ARTHROPODA: The Animals with 



Jointed Legs 53 



The Wood-louse, or Sow-bug 53 



The Lobster, or Crayfish -54 



The Crab 60 



The Cyclops 62 



The Flattened Centipede 64 



The Locust, or Grasshopper 65 



The Dragon-fly 68 



The Butterfly 71 



The Spider 72 



The Classification of the Arthropoda .... 74 



VIII. BRANCH MOLLUSCA: The Oyster, Clams, and 



Snails 77 



The Clam ......... 77 



The Snail 82 



The Squid 83 



The Classification of the MoUusca 85 



IX. BRANCH CHORDATA: The Vertebrates . . 87 



The Perch 87 



The Frog 02 



The Bird 98 



The Classification of the Vertebrates .... 102 



