DELICATE TRACERY of this highly magnified siphonophore 

 suggests a sunburst jeweled with pearls. It is a free swimming 

 hydrozoan, often translucent and sometimes highly colored. Be- 

 low is the head of a blue shrimp, Macrobrachium ollersii, taken 

 from a fresh water stream on Chatham Island in the Galapagos 

 Archipelago. 



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