Lion's Mane jellyfish
Description and Comments
Was doing a tour along the peninsula of Sneffelsnes in Iceland when I came upon a beach which looked like it could have some stranded cnidarians. And indeed it did. It was morning, and several Cyanea Capillata were found stranded on the beach. Size varied from 30 cm (length of bell) to 1 m. There were also other cnidarians, but I've made a new sighting for them.