Photos: Large 18-inch jellyfish washed up on Burnham-On-Sea beach Beach users in Burnham-On-Sea, Berrow and Brean have this week been warned to watch out for jellyfish after this large specimen was washed up. Several Moon and Barrel jellyfish, which can deliver a mild sting, have washed up over the past few days. Beach walker Darren Gill found this 18-inch jellyfish on Burnham beach on Thursday (July 8th), adding: “It was between the jetty and the sailing club end of the beach just at the turn of the tide. I thought it unusual as it had quite a big transparent body covering what looked like a skeleton underneath.”