SOME CREEPING THINGS. 125 



above, through the jaw, so as to always keep them 

 just the right length. There is very much more 

 about the sea-urchin which is of interest, but we 

 cannot learn it now. 



But where do sea-urchins live? 



Mostly in shallow water, and especially around 

 rocks. 



And are there many kinds? 



Yes; there are large ones and small ones, round 

 ones and flat ones, and a number of species of 

 each kind. Some have spines as thick as a pen- 

 cil, while in others they are as fine as hairs. 



One thing more: what do they eat? 



Chiefly seaweed, but sometimes dead fishes or 

 other animal matter. 



Now we must turn to Augustus and his sea- 

 anemone. It has opened in the jar of water, but 

 there are plenty of closed ones on the rocks 

 around us. Does it resemble the starfish? 



Not much, only it has a mouth in the center. 



But has it tube-feet to cling and walk with? 



I cannot see any. 



True, it has none; and it is a much simpler ani- 

 mal than the last two. But what has it around 

 its mouth? 



It has a row of soft tubes, looking like the pet- 

 als of a flower. 



