FISHES OF THE OLD RED SANDSTONE. 
From the peculiar shape of this Fish—Drepanaspis or Sickle-shield—it is supposed to have been a crawler rather than a swimmer. 
The larger segments marked on the body show the 
position of the armour-plates; these were united together by a thick skin, strengthened by a pavement of closely-set scales. These are the smaller divisions between the shields. 
