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Harpoceras sp. Yokoyama, M., 1904b p. 14, pl. 4, fig. 2 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 301. |
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Grammoceras ? Okadai Yokoyama Holotype Yokoyama, M., 1904b p. 14, pl. 4, fig. 3 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 301. |
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Dactylioceras helianthoides Yokoyama Lectotype Yokoyama, M., 1904b p. 16, pl. 4, fig. 6 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 301. |
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Dactylioceras helianthoides Yokoyama Paralectotype Yokoyama, M., 1904b p. 16, pl. 4, fig. 4 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 301. |
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Dactylioceras helianthoides Yokoyama Paralectotype Yokoyama, M., 1904b p. 16, pl. 4, fig. 5 Mesozoic | Mollusca : Cephalopoda Material Reports, no. 2, p. 301. |
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