John Gwyn Jeffreys | |
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| Born | 18 January 1809 Swansea, Wales |
| Died | 21 January 1885 (aged 76) |
| Nationality | British |
| Scientific career | |
| Fields | conchology, malacology |
| Signature | |
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John Gwyn Jeffreys FRS (18 January 1809 – 21 January 1885) was a British conchologist and malacologist.