The types of jellyfish you're most likely to see at Welsh beaches - and which have the worst stings Careful - some of them pack a mean sting A barrell jellyfish washed up at Black Rock Sands, Morfa Bychan Sign up to our free newsletter for the top North Wales stories sent straight to your e-mail Invalid EmailSomething went wrong, please try again later. Sign up now! We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time.More info