HADIATA DIAGRAM 7. 



165 



solid framework remains, which supported the flesh of the animal ; 

 and it is this horny part alone which is used. 



The sea- anemones are closely allied to the corals, but have no 

 hard skeleton ; they live fixed to rocks, and when thev open, and 

 unfold their beautifully coloured tentacles, they appear like 

 moving flowers. 



The medusce or jelly-fish somewhat resemble the anemones, 

 but live floating on the sea. Some sting severely; but they 

 consist almost entirely of sea- water ; and even the largest species, 

 though measuring two or three feet across, will dissolve so com- 

 pletely as to leave no more than a film on paper. 



The starfish, which have five or 

 more arms radiating from the 

 centre of the body, and the sea- 

 hedgehogs, or sea-eggs, which are 

 round and covered with spines, 

 are also radiata. 



Starfish. Some authors also place in 



this sub-kingdom those swarms of exceedingly 



Medusa, 



lufu&oria magnified 

 150 times. 



Infusoria magnified Infusoria magnified 

 300 times. 100 times. 



