Fig. 7. A part of the algal plain 180 m from the face of the reef, 



near th,e limit of plant cover. Species of Halimeda , Udotea , 

 and Avrainvillea are shown. 



Fig. 8. 



Aspect of algal plain at outer limit of vegetation, 180 

 from the face of th.e reef. 



VI-139 



