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CORAL HEADS. Systematic surveys made prior to 

 the tests uncovered valuable information on ma- 

 rine life and reef structure. At 26 localities around 

 the atoll detailed traverses were made, showing 

 reef profile, with its channels, pools, and caverns, 

 and the relative abundance of various organisms 

 and sediments. Shown above are two typical coral 

 heads, some six feet in diameter, on the lagoon 

 reef off Oruk Island. The central portion of these 

 heads is a brilliant pink coral, with a different va- 

 riety, yellow-green in color, forming the platelike 

 exterior. 



