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Geisonoceras abruptum Kobayashi Holotype Kobayashi, T., 1934b p. 416, pl. 20, fig. 3 Paleozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 83. |
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Geisonoceras hyatti Kobayashi Holotype Kobayashi, T., 1934b p. 415, pl. 23, figs. 3, 4 Paleozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 83. |
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