The outside of the finna is covered with a thick, multi-layered shell. The surface of the finna is smooth and clearly separated from the surrounding tissues. The inner layer of the shell is called the germinal layer. It gives rise to daughter bladders inside the finna. Several heads with necks are screwed into each daughter bladder. The daughter bladders may give rise to granddaughter bladders. The cavity of the finna is filled with fluid. Write the name of this finna. You don't need to use punctuation marks. You don't need to use articles. Sample response: limb