Other cnidarians, such as the jellyfish Cyanea capillata (the "Lion's Mane" made famous by Sherlock Holmes) or the hydrozoan Physalia physalis (Portuguese man o' war, "Bluebottle") can cause extremely painful and sometimes fatal stings.
At the bathing pond, Holmes spots the murderer: it is a Lion's Mane Jellyfish (Cyanea capillata), a deadly creature about which Holmes has read.
Those familiar with "The Adventure of the Lion's Mane" will recall that Sherlock Holmes retires to Fulworth to keep bees.
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