450 



RADIATA: ECHINODERMATA. 



able to bend themselves in every direction, and thus work 

 their way into holes and fissures in rocks where we would 

 not expect to find them. Star-fishes feed upon mollusks 





Star-fish, Asteracanthion. 



and other marine animals ; and when they feed they turn 

 the stomach out of the mouth and over the food to be 

 devoured. 



On the back, near the junction of two of the arms, is 

 the madreporic body, described in speaking of the Sea- 

 urchins. It is a sort of minute sieve, and forms an en- 

 trance to a series of internal water-tubes, some of them 

 connecting with the locomotive suckers and supplying 

 them with water. Water is also admitted into the body 



