TEXT FIGURES 



Page 



1. Map showing the distribution of coral reefs throughout 



the world 16 



2. Section of a fringing reef illustrating the manner of 

 development 21 



3. Section of a barrier reef 22 



4. Section of the outer edge of a reef 23 



5. Section of an atoll 25 



6. Chart of Nukulaelae, an atoll in the Ellice Island group, 

 South Pacific. H. O. 1981 26 



7. Sections illustrating the formation of barrier reefs and 



atolls according to Darwin's theory 29 



8. Sections of an atoll comparing the subsidence theory and 



the submarine bank theory of origin 31 



9. Section illustrating the formation of a platform by wave 

 action in the marginal seas, during glaciation 33 



10. Lengthwise and cross-sections of a simple anemone and 



a simple coral 43 



11. Lengthwise sections of corals illustrating modes of 

 branching and colony formation 44 



