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Sigmorthoceras coreanicum (Kobayashi) Kobayashi, T., 1934b p. 413, pl. 22, fig. 7 Paleozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 82. |
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Sigmorthoceras sigmoidale Kobayashi Holotype Kobayashi, T., 1934b p. 414, pl. 21, figs. 1-3 Paleozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 82. |
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