Tritonia hombergii has no common name despite being readily found around most of the UK. It is our biggest sea slug or nudibranch reaching 20cms. Colour varies from white to a yellowish brown and they feed almost exclusively on the polyps of soft corals, particularly dead man's fingers, Alcyonium digitatum. They are frequently seen laying an intestine-like egg coil containing many thousands of eggs. They should not be touched as they can discharge a mucous if disturbed which may cause blistering on the skin.
North Sea. St. Abbs Marine Reserve