40 



The Liv'mg Thmgs of the Earth unit i 



ARTHROPODS 



Grasshopper 



MOLLUSKS 



ECHINODERMS 



Snail 



Starfish 



ANNELIDS 



NEMATHELMINTHS 



PLATYHELMINTHS 



Earfh 



worm 



Hookworm — Roundworm 



Planaria — Flatworm 



COELENTERATES 



SPONGE ANIMALS 



PROTOZOA 



Jellyfish 



Fresh water Sponge ^^ Ameba 



Fig. 49 The invertebrates are classified by zoologists into mmierous phyla. One vtem- 

 ber of each of the nine principal phyla is illustrated above. Do you know other 

 members of these phyla? 



