Pa 256 Groptolithus priodon.
| 分類 | Animals: Coelenterata: Hydromedusa:Graptolitida: |
| 年代 | Paleozoic Ordovician Caradoc: |
| 産地 | Coniston. |
| 文献 | Department of Science, Tokio-Daigaku, 1881: Catalogue of Palaeontological Specimens. Middle Case., pp. 1–46. Department of Science, Tokio-Daigaku. |
