134 



FIRST LESSONS IN ZOOLOGY 





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The sea-anemones, 

 corals, and jellyfishes 

 compose the animal 

 branch Civlcntcrata. 



Starfishes and sea- 

 urchins. — Among 

 the most easily found 

 and most readily rec- 

 ognized seashore in- 

 vertebrates are the 

 starfishes and sea- 

 urchins, which belong 

 to the animal branch 

 called EcJiinodcrniata 

 (fig. 96). Although 

 these animals do not 

 look at all alike, the 

 starfishes having a 

 body composed of 

 central disk and long 

 ra\-s or radiating arms, 

 and the sea-urchins 

 looking like spiny 

 flattened balls, they 

 are rea]l\- closely re- 

 lated. In each the 

 bod_\-, witli its various 

 organs, is l)nilt on a 

 radiate plan of stnic- 



