Friele H. (1886). Zoology, Mollusca II. <i> Den Norske Nordhavs-expedition, 1876-1878</i>, 3(16): 1-44, pl. 7-12, available online athttp://biodiversitylibrary.org/page/7325215 page(s): 33, pl. 11 figs 17, 18-18a [details]
original descriptionFriele H. (1886). Zoology, Mollusca II. <i> Den Norske Nordhavs-expedition, 1876-1878</i>, 3(16): 1-44, pl. 7-12, available online athttp://biodiversitylibrary.org/page/7325215 page(s): 33, pl. 11 figs 17, 18-18a [details]