basis of recordGould, S.J. (1969). An evolutionary microcosm: Pleistocene and Recent history of the land snail <i>P. (Poecilozonites)</i> in Bermuda. <em>Bulletin of the Museum of Comparative Zoology.</em> 138(7): 407-532., available online athttps://www.biodiversitylibrary.org/page/4631789[details]