"The Adventure of the Lion's Mane" (1926), one of the 56 Sherlock Holmes short stories written by British author Sir Arthur Conan Doyle, is one of 12 stories in the cycle collected as The Case-Book of Sherlock Holmes. It is notable for being narrated by Holmes himself, instead of by Dr. Watson (who does not appear in the story). "The Lion's Mane" was indirectly referenced in the BBC adaptation Sherlock in "The Six Thatchers", where Sherlock and John, while solving cases, jokingly comment on the stupidity of arresting a jellyfish. In the CBS adaptation Elementary, in the introduction of The Geek Interpreter, Sherlock briefly reports solving the 1926 cold case death of Fitzroy McPherson, identifying the Lion's Mane jellyfish as the culprit.
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