206 



THE BOTTOM OF THE SEA. 



covered with plates or lamellae, radiating from the centre 

 towards the circumference. Protruding irom the disc 

 are a great number of tentacuke, which the animal 



' Fig. 43. — Fungia Agariciformis. 



contracts or extends at will from between the sharp, 

 thin plates of the polypier. At the end of each ten- 

 tacle a sucker is represented ; it is used by the animal 

 to capture its prey» 



