The word "myth" seems to have two meanings in English: first, ancient and enduring tales containing deep meanings about human nature and existence itself, and, second, common but mistaken out-dated beliefs. For examples, "myths about nutrition" vs "so-and-so is mythic in depth, scale and scope." Moby Dick is mythic.
Freud's one-time colleague in depth psychology had many interests but among them was a study of myths and the representations of archetypes embedded in them. In a way, Jung viewed myths as related to humanity as dreams are related to an individual. I suppose that seems obvious now.
For reasons I do not understand, the New Republic has decided to dislike Jung: “Tired, Old Myths:” The New Republic Slanders Jung