Century Dictionary and Cyclopedia
- A suborder or superfamily of nudibranchiate gastropods, characterized by the development, of dorsal gill-like appendages variously distributed, but never disposed in a rosette round the anus. It comprised numerous species, classified by modern malacologists among 12 to 15 families. Also called
- In De Blainville's classification (1825), one of five orders of his second section of Paracephalophora monoica symmetrica, composed of the two families Tetracerata and Dicerata.
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