Mélusine or Melusine or Melusina is a figure of European folklore, a female spirit of fresh water in a holy well or river. She is usually depicted as a woman who is a serpent or fish from the waist do
Melusine's secret discovered, from Le Roman de Mélusine by Jean d'Arras, c. 1450–1500. Bibliothèque nationale de France.
Raymond walks in on his wife, Melusine, in her bath and discovers she has the lower body of a serpent. Illustration from the Jean d'Arras work, Le livre de Mélusine (The Book of Melusine), 1478.
Statue of Melusine near the Alzette in Luxembourg
Melusine by Ludwig Michael von Schwanthaler (1845)
Lamia, in ancient Greek mythology, was a child-eating monster and, in later tradition, was regarded as a type of night-haunting spirit or "daimon".
Melusine
…a female spirit of fresh water in a holy well or river. She is usually depicted as a woman who is a serpent or fish from the waist down (much like a lamia or a mermaid). She is also sometimes illustrated with wings, two tails, or both. Her legends are especially connected with the northern and western…
The Kiss of the Enchantress (Isobel Lilian Gloag, c. 1890), inspired by Keats's "Lamia", depicts Lamia as half-serpent, half-woman
Lamia (first version) by John William Waterhouse (1905).
Lamia (second version), with snakeskin on her lap, John William Waterhouse (1909)
A lamia-like creature on the cover of Other Worlds, November 1949.