Definitions

from The Century Dictionary and Cyclopedia

  • n. A genus of primitive schizodont prionodesmacean pelecypods having two-winged, inequivalve, oblique shells, with obscure dentition, amphidetic external ligament, grooved area, and long straight hinge-line. The species range from Silurian to Carboniferous and are particularly abundant in Devonian formations.

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