6o CORAL-REEFS. 



We shall hereafter have to consider both the cause of its 

 submerged condition, a state common to other banks in the 

 group, and the origin of the singular submarine terraces, 

 which bound the central expanse : these, I think, it can 

 be shown, have resulted from a cause analogous to that 

 which has produced the bifurcating channel across Mahlos 

 Mahdoo. 



