operculum - Hutchinson encyclopedia article about operculum Printer Friendly
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operculum

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operculum

Small cap covering the spore-producing body of many mosses. It is pushed aside when the spores are mature and ready to be ejected.
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As this species has a thick calcareous operculum, I removed it, and when it had formed a new membranous one, I immersed it for fourteen days in sea-water, and it recovered and crawled away: but more experiments are wanted on this head.
The Origin of Species by Darwin, Charles View in context
[6] The large claws or pincers of some of these crabs are most beautifully adapted, when drawn back, to form an operculum to the shell, nearly as perfect as the proper one originally belonging to the molluscous animal.
The Voyage of the Beagle by Darwin, Charles View in context
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