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n. pl.1.(Zool.) A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.
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Elongate; LL complete, with 35 or more scales; anal fin rather long; large suborbital elongate, not completely developed; mouth inferior, with the teeth in two rows rather numerous, narrow, close together, the external row covering the internal one as in Ceratobranchia.