80 STAR-FISHES, SEA-URCHINS, ETC. 



Sytiapta takes in large quantities of fine pebbles, 

 sand, and shell, from which it doubtless extracts 

 considerable nourishment. These objects are dis- 

 tinctly visible through the walls of the body and 

 intestine. 



A much stouter form of the sands is the Caudina, 



Caudina abenabia. 



which is sometimes thrown up in considerable num- 

 bers after a storm. Its color is light yellowish, the 

 texture is tough, and in a distant way the animal 

 might be likened to a cucumber greatly attenuated 

 at one extremity. 



