ACKNOWLEDGMENTThe A t o l l Research B u l l e t i n i s issued by t h e Smithsonian I n s t i t u t i o n a s a p a r t of i t s Tropical Biology Program. It i s cosponsored by t h e Museum of Natural History, t h e Office o f Environmental Sciences, and t h e Smithsonian P r e s s . The Press supports and handles production and d i s t r i b u t i o n . The e d i t i n g i s done by t h e Tropical Biology s t a

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