RELATIONSHIPS OF ECHINODERMA. 



277 



Antedon and othe 

 comatulids swim g 

 the others sway their 

 on the top of stalks. 



There is a mot 

 sensory antambulac 

 vous system, and th 

 ambulacral system, 

 is mainly sensory. 

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The mou 

 and centra 

 no anus. 



The reprodu 

 organs lie in the 1 

 and open interrac 

 at the bases of 

 arms. 



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