from The Century Dictionary.
- A group of prosobranchiate gastropods, approximately equivalent to Scutibranchia, Rhipidoglossa, or Chiastoneura. It includes such families as Fissurellidæ, Haliotidæ, etc. Also
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) A group of Gastropoda, with limpetlike shells, including the abalone shells and keyhole limpets.
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