Jeffreys, John Gwyn, 1809-1885

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Biographical History

John Gwyn Jeffreys (1809 - 1885) was a was an English naturalist who studied mollusks. He was born in Swansea, Britain, on January 18, 1809. He had a lifelong interest in conchology that began in childhood. A lawyer by profession, he spent holidays collecting and in later years took part in expeditions on ships including the Lightning, Porcupine, and Valorous. Jeffreys studied and wrote about mollusca of the British islands and northern Europe. He amassed a specimen collection primarily documenting the northern Atlantic, which is held at the National Museum of Natural History. He passed away in Kensington, Britain, on January 24, 1885.


  • Library of Congress. NACO. Control Number: n85011467
  • Wall, D. H. (1885). “John Gwyn Jeffreys.” Science. (5) 107, 145-146. Retrieved on September 16, 2013 from

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