Fig. 12. Reef eoral association at a depth of about 40 meters on the fore- 

 reef slope. The position of this steep submarine decHvity is shown by the up- 

 per arrow on profile B in Fig. 10. The flat, platelike corals are Agaricia undata, 

 here growing on a large heap of unconsolidated talus. These corals are not 

 building primary framework; indeed, the colonies were poorly attached to the 

 bottom, and heavy destruction by boring sponges was in evidence. The tall 

 objects in the middle are sponges, and the wiry growths on the overhang are 

 Antipatharia. 



40 



