Remember the movie Splash? Well, Daryl Hannah's enchanting character, Madison, was probably based on this mysterious woman, who we imagine was called "Cordelia." Like the character in the movie, Cordelia probably rescued boys and young men from the shores of Sunnyside Beach in the early 1900s.
The men must have sworn that Cordelia had a long, mermaid-like fin when she swam underwater and that once on land, her fin would dry up and sprout legs. Of course, people would have attributed these rumours to heat stroke and "too much water in the ears," but they would have explained why Cordelia disappeared in the summer of 1916 along with a singing crab.