from The Century Dictionary and Cyclopedia
- n. A genus of neotrematous brachiopods of the family Discinidæ, having circular chitinous shells, the pedicle passage being in the form of a slit which extends from the beak of the pedicle-valve forward, and closed behind, as growth advances, by a listrium. It is common in all rocks from the Lower Silurian to the Cretaceous.
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