Berry, S. S. (1941). New Mollusca from the Pleistocene of San Pedro, California-II. <em>Bulletins of American Paleontology.</em> 27(101): 1-20., available online athttps://www.biodiversitylibrary.org/page/10668681 page(s): 3, pl. 2 fig. 6 [details]
original descriptionBerry, S. S. (1941). New Mollusca from the Pleistocene of San Pedro, California-II. <em>Bulletins of American Paleontology.</em> 27(101): 1-20., available online athttps://www.biodiversitylibrary.org/page/10668681 page(s): 3, pl. 2 fig. 6 [details]