M 830 Cyrena majuscula. A Roem.
| 分類 | Animals: Mollusca: Mollusca Proper: Concifera: |
| 年代 | Mesozoic Jurassic Wealden: Wealden Proper: |
| 産地 | Obernkirchen b. Minden, Westphalia. |
| 文献 | Department of Science, Tokio-Daigaku, 1881: Jurassic formation. Catalogue of Histrical Geology. Mesozoic., pp. 1–38. Department of Science, Tokio-Daigaku. |
