- Yokoyama, M., 1926h:
- Tertiary shells from Tosa.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 9, pp. 365–368, pl. 42.
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- Yokoyama, M., 1926i:
- Fossil shells from the Atsumi peninsula, Mikawa.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 9, pp. 369–375, pl. 43.
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- Yokoyama, M., 1926j:
- Fossil Mollusca from the oil-fields of Akita.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 9, pp. 377–389, pls. 44–45.
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- Yokoyama, M., 1927a:
- Mollusca from the upper Musashino of Tokyo and its Suburbs.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 10, pp. 391–437, pls. 46–50.
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- Yokoyama, M., 1927b:
- Mollusca from the upper Musashino of western Shimosa and southern Musashi.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 10, pp. 439–457, pls. 51–52.
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- Yokoyama, M., 1927c:
- Fossil Mollusca from Kaga.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 165–182, pls. 47–49.
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- Yokoyama, M., 1927d:
- Tertiary fossils from western Hizen.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 183–190, pl. 50.
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- Yokoyama, M., 1927e:
- Tertiary shells from the coal-field of Haboro, Teshio.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 191–204, pls. 51–52.
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- Yokoyama, M., 1927f:
- On the occurrence of the lower Tertiary formation in the Province of Hoki.
- Journal of the Geological Society of Tokyo, vol. 34, no. 406, pp. 13–14, pl. 8.
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- Yokoyama, M., 1928a:
- Pliocene shells from Hyuga.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 331–350, pls. 66–67.
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- Yokoyama, M., 1928b:
- Neogene shells from the oil-field of Higashiyama, Echigo.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 351–362, pls. 68–69.
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- Yokoyama, M., 1928c:
- Semi-fossil shells from Noto.
- Imperial Geological Survey of Japan, Report, no. 101, pp. 113–128, pls. 19–21.
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- Yokoyama, M., 1929a:
- Neogene shells from some provinces of Chugoku.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 8, pp. 363–368, pl. 70.
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- Yokoyama, M., 1929b:
- Molluscan fossils from Karafto.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 9, pp. 369–398, pls. 71–76.
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- Yokoyama, M., 1929c:
- Pliocene shells from near Nanao, Noto.
- Imperial Geological Survey of Japan, Report, no. 104, pp. 1–7, pls. 1–6.
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- Yokoyama, M., 1930a:
- Neogene shells from Yamashiro.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 399–403.
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- Yokoyama, M., 1930b:
- On a univalve called Cochlioconus gradatus Yokoyama.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 405–406.
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- Yokoyama, M., 1930c:
- Tertiary Mollusca from south Karafto.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 407–418, pls. 77–80.
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