I believe there is a Wealthy N. (or Welthian!) Dart, b. in Ct who was the daughter of Ezra & Eunice N. Dart. Ezra & Eunice ultimately ended up living in Groton, CT and are buried in Starr Cemetery, Groton, CT.

Many of their children are buried there as well including "Welthy"...who was married to a Frank Hempstead. Frank & "Welthy" [sic] Hempstead and some of their children can be found through Groton, CT census info. as well as their graves at STARR CEMETERY in Groton, CT.
(If you use findagrave.com, you can find more specific info.) Hope this helps!