William Swainson FLS , FRS ( 8 October 1789 - 6 December 1855 ) , was a British ornithologist , malacologist , conchologist , entomologist and artist .
William John Swainson , Fellow of the Linnean Society and Fellow of the Royal Society ( 8 October 1789 - 6 December 1855 ) , was an English ornithologist , malacologist , entomologist and artist .