[AS. shell or husk.] One of the thin plates covering the body of a fish or of a reptile. Ganoid scales of fish' like the gar and sturgeon are an inner layer of bone and an outer layer of shining enamel arranged to form a coat of mail. The Perch family have comb-1 ike scales. Those of the herring and salmon are thin, with concentric lines of growth, and serrated on the margin, and are called cycloid scales.