222 



RADIATES: ECHINODERMS. 



!Fig. 466. — Mellita. Southeast coast of United States. 



in diameter, and have 

 spines from a quarter 

 of an inch long to 

 three or four inches 

 in length. Some of 

 them are capable of 

 making holes in hard 

 substances, even in 

 limestone and granite. 

 Other kinds, like 

 Figures 465, 466, 46T, 

 burrow in the sand. 

 These are much flat- 

 tened. 



Fig. 467 . — Eotiila. Coast of Africa. 



STAR-FISHES, OR SEA-STARS. 



Star-Fishes are common on all rocky coasts. They 

 are readily found by looking under the sea-weed in 

 pools that have been left by the tide. They are so 

 named from their star-like form, the disk or central 



