MolluscaBase name details
original description
Yokoyama, M. (1925). Molluscan remains from the uppermost part of the Jô-ban coal-field. <em>Journal of the College of Science, Imperial University, Tōkyō.</em> 45(5): 1-34, pls. 1-6.
page(s): 27–28, pl. 2, fig. 4, pl. 4, figs 1–6 [details]