from The Century Dictionary.
- A suborder or superfamily of zygobranchiate gastropods, having paired ctenidia functioning as gills. It contains the Haliotidæ and Fissurellidæ, or seaears and keyhole-limpets.
- A suborder of palliate or tectibranchiate opisthobranchiate gastropods, containing those which retain the ctenidia as functional gills, as the Tornatellidæ, Bullidæ, Aplysiidæ, etc.
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