Doris

Doris, one of the best known genera of Nudibranchiate (q.v.) Gastropoda or "Sea-slugs." It is the type of the family Doridce, or the "Sea-lemons." They are always shell-less, and are depressed, flat animals, with a pair of tentacles standing up in front and -a clump of gills behind. They creep about over seaweeds and rocks; they occur in all seas from the tropics to the frigid zones; they all live near the shore and rarely occur at a depth of more than twenty-five fathoms.