As well, refining a proposal made by Siebert, Costa adduces evidence indicating an east-west split with the SNEA subgroup. On both phonological and lexical grounds, a distinction within SNEA can be made between a Western SNEA group consisting of the languages of central and Eastern Long Island, Connecticut and southern Rhode Island: Mohegan-Pequot-Montauk, Quiripi-Naugatuck, and Unquachog; and an Eastern group consisting of Massachusett and Narragansett. Loup, probably aboriginally found on the northern border of the Western SNEA area and to the west of Massachusett, would appear to share features of the Western and Eastern subgroups.