rhoumbus punctatus

from The Collaborative International Dictionary of English v.0.48

Topknot \Top"knot`\, n.
   1. A crest or knot of feathers upon the head or top, as of a
      bird; also, an ornamental knot worn on top of the head, as
      by women.
      [1913 Webster]

            A great, stout servant girl, with cheeks as red as
            her topknot.                          --Sir W.
                                                  Scott.
      [1913 Webster]

   2. (Zool.) A small Europen flounder ({Rhoumbus punctatus}).
      The name is also applied to allied species.
      [1913 Webster]