Definitions

from The Century Dictionary and Cyclopedia

  • In Lamarck's classification, 1801, one of two divisions of his conchiferous Acephalæa, containing the equivalve bivalves: opposed to Inæquivalvia.
  • In Latreille's classification, 1825, one of two divisions of pedunculate Brachiopoda (the other being Inæquivalvia), represented by the genus Lingula. See cut under Lingulidæ.

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