spotted sand flounder

from The Collaborative International Dictionary of English v.0.48

Windowpane \Win"dow*pane`\, n.
   1. (Arch.) See {Pane}, n., (3)
      b . [In this sense, written also {window pane}.]
        [1913 Webster]

   2. (Zool.) A thin, spotted American turbot ({Pleuronectes
      maculatus}) remarkable for its translucency. It is not
      valued as a food fish. Called also {spotted turbot},
      {daylight}, {spotted sand flounder}, and {water flounder}.
      [1913 Webster]