polybranchiata

Century Dictionary and Cyclopedia

1. 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 Polybranchia.
2. 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.