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- John Clarkson Jay (1808–1891), American amateur conchologist.
- John Gwyn Jeffreys (1809–1885)
- Charles W. Johnson (naturalist) (1863-1932), American naturalist and malacologist
- George Johnston (malacologist) (1797–1855), British malacologist
- Israel Heymann Jonas (1795–1851), German malacologist
- Félix Pierre Jousseaume
Read more about this topic: Malacologist