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     18. Sea Lettuce (Ulva lactuca). This common form of shellfish in North America, although—or more probably 
     
     seaweed often washes ashore in saltmarshes, conspicuous because—it is considered inedible by humans. Neverthe' 
     
     because of its bright green colon Atlantic Ribbed Mussel less, it is a delicacy to marsh residents as different as rac' 
     
     (Modiolus dmissus). This is die-most common form of coons and gulls 
     
    
   
   
    
     -12-