and of the East African Mainland. 43 



Atoll formations in miniature near Zanzibar and in the 

 mainland barrier. See also comparison of Pemba and the 

 Bermudas above. 



5. Thai the luxuriance of coral groivth, and especially the depth 

 to which it extends, depend upon the depth of the adjacent sea and 

 upon the purity of its water. 



6. That recent growth cannot form typical reefs in these regions 

 under present conditions, since the surf is not strong enough to 

 throw up sufficient coral fragments above the level of low tide 

 for the formation of reef conglomerate. For the same reason 

 typical fissured reef -edges are not being formed. 



