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“It will appear, to the inexperienced eye, to be perfectly and fully well expanded for three, four, or five days after capture, but during all this time it is quietly exfoliating its epidermis, both externally and internally, and finally indicates its illness, in its extreme, by falling from its attachment, and lying inactively at the bottom of the aquarium, contracted and rolled up into a shapeless mass.”
Henry James Clark, Lucernariae and Their Allies (1878)
