ARTHROPODA. 



285 



FIG. 253. Barnacles, or Pedunculate Cirripedes (Lepa* 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 



Fie. 264. Acorn-shells (Balanu) on FIG. 255. Water-fleas : 1, Cyclops communis; 

 the Shell of a Whelk (Buccinum). 2. Cypris unifasciata; 3, Daphnia pvtex. 



