Definitions

from The Century Dictionary and Cyclopedia

  • n. A genus of neotrematous brachiopods of the family Discinid√¶, 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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