. Fig, Stalked Barnacles. moved from the hull, a basal, limy plate is gen- erally left behind. The other type of Barnacle is the Stalked or Gooseneck Barnacle (fig. 3). \Vhereas Acorn Bar- nacles are attached to the hull by the calcareous plates -which form the cone-shaped shell, Stalked Barnacles have a muscular stalk which suspends the body from the hull. The body proper of both types is always protected by limy plates. 13

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