ABTHROPODA. 



285 



Fig. 253.— Barnacles, or Pedunculate Cirripedes (Lepas anati/era). 



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, f ourteen-footed species ; as the 



Fig. 254.— Acorn-shells {Balanus) on Fig. 255.— Water-fleas : 1, Cyclops communis; 

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



