Western Atlantic coast of the USA: Massachusetts to Florida. [details]
Atlantic Ocean: from Massachusetts to North Carolina (USA). [details]
The species is named after Milton Gray, who collected the type material. [details]
Pettibone (1956) does not state a genus gender, but Hesione is feminine, and therefore Parahesione is feminine also. [details]
In thicky muddy tubes of Sabaco elongatus (Verrill, 1873) (as Maldanopsis elongata), and on muddy and sandy ... [details]
Wellfleet Harbor, Cape Cod Bay, Massachusetts, USA, Atlantic Ocean (gazetteer estimate 41.9249°, -70.0278°). [details]
Hadley Harbour, Uncatena Island, Woods Hole area, Massachusetts, USA, Atlantic Ocean (gazetteer estimate 41.516°, ... [details]