Anthobranchia \An`tho*bran"chi*a\, n. pl. [NL., fr. Gr. 'a`nqos flower + ? gills, n. pl.] (Zo["o]l.) A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. See {Nudibranchiata}, and {Doris}.