Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.
Source: wiktionary
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2 total sentences available.
Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.
Source: wiktionary
I lifted the circular operculum from its place and laid it carefully on the bale.
Source: wiktionary