ARTHKOPODA. 
285 
Fig. 253.—Barnacles, or Pedunculate Cirripedes {Lepas anatifera). 
united to this class, but now are known to be widely re¬ 
moved from it. The former is by some authors removed 
from the Crustacea. 
3. Tetradecapods , small, fourteen-footed species; as the 
Fig. 254.—Acorn-shells ( Balamis ) on Fig. 255.—Water-fleas: 1 , Cyclops communis; 
the Shell of a Whelk ( Buccinum ). 2. Cypris unifasciata; 3, Daphnia pulcx. 
