Source : Webster's Revised Unabridged Dictionary (1913)

Lophobranchii \Loph`o*bran"chi*i\, n. pl. [NL., fr. Gr. ? a
   crest or tuft + ? gill.] (Zo["o]l.)
   An order of teleostean fishes, having the gills arranged in
   tufts on the branchial arches, as the Hippocampus and
   pipefishes.