Definitions

from The Century Dictionary and Cyclopedia

  • In De Blainville's classification (1825), one of the four families of his monopleurobranchiate Paracephalophora monoica, containing the genera Umbrella, Siphonaria, and Tylodina, having a shell as in Patella, but not including the Patellidæ.
  • In Risso's classification, a family typified by the genus Patella.

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