Pa 721 Mactra Arcuata.
| 分類 | Animals: Mollusca: Mollusca Proper: Lamellibranchiata:Mactridae: |
| 年代 | Cenozoic Tertiary Pliocene: |
| 産地 | Waldringfield. |
| 文献 | Department of Science, Tokio-Daigaku, 1881: Catalogue of Palaeontological Specimens. Middle Case., pp. 1–46. Department of Science, Tokio-Daigaku. |
