I've just returned from a wonderful trip to Vatersay, south of Barra in the Outer Hebrides. At midnight on New Year's eve my friends and I were on a beach when we noticed tiny green-blue lights flashing in the kelp washed up after high winds. It was a very magical experience! The lights seemed to come from tiny worms (polychaetes?), about 1cm long on the surface of the kelp. I don't know whether the worms lived on the kelp or had just been washed up along with it. The light was sometimes steady and sometimes flashed, and came from a row of light organs along the sides of the worms. Sometimes these lit up like a mexican wave. Kicking the piles of kelp would make them begin flashing. I've attached 2 very poor quality photos. It's the worm in the centre that was flashing but this is not visible in the photo. I have failed to find any clues to what the worms are on Google. Does anyone know?