1) Opera based on play 2) Opera by Aribert Reimann 
Melusine (French:meluzin `{respell|may-loo|ZEEN|`}`) (or Melusina) is a figure of European legends and folklore, a feminine spirit of fresh waters in sacred springs and rivers. She is usually depicted as a woman who is a serpent or fish from the waist down (much like a mermaid). She is also sometimes illustrated with wings, two tails, or both. ......
(from the article `Hellens, Franz`) Later the influence of the American writer Edgar Allan Poe became paramount, and Hellens produced works in which fantasy, mystery, and external ...
In heraldry, melusine is a mermaid with two tails.
European Folklore) - Female spirit who hangs out in springs and rivers. Kind of like a mermaid.