58 



Fig. 82 An eartbwun/i burrowing in the soil. 

 It looks shiny because its skin is moist. (Schnei- 

 der AND SCHWAiaz) 



Fic. 83 



you see 



( AMEUIC: 



I'Lviiiria is less tl.HTii one inch long. Do 

 the exiling lube 'vehich it can extend? 



AN MUSEUM or NAI UKAE HISTORY) 



The L'tv'mg Things of the Earth unit i 

 PHYLUM - PLATYHELAIINTHS 



F la fd: 011ns 



Tapeworms and their relatives. The 



phity helminths (pla-tee-hel'minths) in- 

 chide the tapeworms and the hver flukes, 

 both of whicli are parasites. Tapeworms 

 are flat like a ribbon, but it is a ribbon 

 made up of separate pieces which can be 

 dropped off one by one. Tapeworms may 

 reach a IcnjTth of twenty feet. Some 

 species live in man's intestines, hooked 

 to the wall bv the curved spikes and 

 suckers on their heads. Thev live on the 

 food which man has dii^ested. You will 

 read more about tapeworms later. 



Other flatworms that are of great im- 

 portance to man because they attack him 

 or his domesticated animals are the liver 

 flukes. They are tiny worms that live in 

 the liver of sheep and other animals. 

 They do great damage. One very com- 

 mon flatworm, Planar ia (plan-air'ree-a), 

 lives in sluggish streams, hidden under 

 stones. Examine Figure 83. Although 

 Planaria is of no economic importance, 

 it has been studied and experimented 

 with by many zoologists. 



PHYLUM - COELENTERATES 



Aii'nnah Whose Bodies Are S'niiple Sacs 



Sea anemones. The coelenterates (see- 

 len'ter-ates ) are of great interest to zo- 

 ologists but most of them are of little 

 economic importance. If you sec jraily 

 waving tentacles above a delicately tinted 

 body fastened to the sea bottom \on are 

 looking at a sea anemone (a-ncm'o-nce), 

 the "flower" of the ocean. Man\' are 

 blow 11 in color; some forms arc pini«; or 

 rose-colored; others are oranoc or bluish 



