Siphonalia declivis Yokoyama
| 1957. | Siphonalia declivis Yokoyama Makiyama, J. 1957 pl. 9, fig. 15 |
| 1923. | Siphonalia cassidariaeformis (Reeve) Yokoyama, M. 1923b p. 9, pl. 1, fig. 15 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Gastropoda: Buccinidae: |
| Geologic Time: | Cenozoic: |
| Makiyama, J., 1957: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 1. Palaeontological Society of Japan, Special Papers, no. 3, pp. 1–4, pls. 1–24. (Reference No. 0367) |
| Yokoyama, M., 1923b: Tertiary Mollusca from Dainichi in Totomi. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 2, pp. 1–18, pls. 1–2. (Reference No. 0468) |
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| Ichikawa, T., 1983, no. 9, p. 39. |
| Ichikawa, T., 1983, no. 9, p. 291. |
