Imp—an evil spirit of low rank; a small, puny, or contemptible devil. (Russian folk tales often make use of this spirit.)
Undine—a female water-spirit without a soul, with which she might be endowed only by marrying a mortal and bearing a child. (<Latin unda, wave.)
Werwolf—a person who, according to mediæval superstition, became voluntarily or involuntarily a wolf and in that form practiced cannibalism. (<A. S. wer, man + wulf, wolf.)
Wraith—a fantom of a living person, supposed to be ominous of that person's death.
Lamia—a female demon or vampire that enticed youths and fed upon their flesh and blood. (Classical mythology.)
Merrow—a mermaid. (Irish mythology.)
Monaciello—the house-spirit of Naples.
Nightmare—an evil spirit once supposed to oppress people during sleep. Called also Incubus. (<A. S. niht, night + maere, a nightmare.)
Ogre—a demon or monster that was supposed to devour human beings. (<French ogre. The derivation is uncertain.)
Ouphe—an elf or fairy. (<the Scandinavian. A variation of oaf = elf.)