- Yokoyama, M., 1925e:
- On a new species of Cucullaea from Omi.
- Journal of the Geological Society of Tokyo, vol. 32, no. 387, pp. 7–8, pl. 7.
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- Kobayashi, T., 1926:
- Note on the Mesozoic formations in Prov. Nagato, Chugoku, Japan.
- Journal of the Geological Society of Tokyo, vol. 33, no. 398, pp. 1–9, pl. 11.
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- Yokoyama, M., 1926a:
- On some Pliocene shells from Kaga and Noto.
- Journal of the Geological Society of Tokyo, vol. 33, no. 391, pp. 9–11, pl. 2.
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- Yokoyama, M., 1926b:
- Tertiary Mollusca from Shiobara in Shimotsuke.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 4, pp. 127–138, pls. 16–20.
- Yokoyama, M., 1926c:
- Molluscan fossils from the Tertiary of Mino.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 7, pp. 213–227, pl. 28.
- Yokoyama, M., 1926d:
- Neogene shells from Kozuke and other provinces.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 7, pp. 229–233, pl. 29.
- Yokoyama, M., 1926e:
- Tertiary Mollusca from the oil-fields of Embets and Etaibets.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 7, pp. 235–248, pls. 30–32.
- Yokoyama, M., 1926f:
- Fossil shells from Sado.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 8, pp. 249–312, pls. 32–37.
- Yokoyama, M., 1926g:
- Tertiary Mollusca from southern Totomi.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 9, pp. 313–364, pls. 38–41.
- 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.
- 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.
- 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.
- Makiyama, J., 1927:
- Lycoptera chosenensis, a new species of Leptolepiformes from Singisyu.
- Chikyu [The Globe], vol. 7, no. 6, pp. 448–452. (in Japanese)
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- Ozawa, Y., 1927a:
- Stratigraphical studies of the Fusulina limestone of Akasaka, Province of Mino.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 3, pp. 121–164, pls. 34–46.
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- Ozawa, Y., 1927b:
- Studies on the Akasaka limestone, Part 1 and 2.
- Journal of Geography, vol. 39, nos. 460–461, p. 320-331, 381-392, pl. 9. (in Japanese)
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- Ozawa, Y., 1927c:
- Some Carboniferous fossils collected in Manchuria and Korea.
- Japanese Journal of Geology and Geography, vol. 5, no. 3, pp. 77–93, pl. 7.
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- Ozawa, Y., 1927a:
- Stratigraphical studies of the Fusulina limestone of Akasaka, Province of Mino.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 3, pp. 121–164, pls. 34–46.
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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.
- 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.
- 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.