original description(ofCrepidula convexa Yokoyama, 1925 †)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): 14 [details]
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