ARTHROPODA. 



285 



-'~i\?^'^"'^-~ 



Fig. 263. — Barnacles, or Pedunculate Cirripedefl (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. Teiradecapods, small, fourteen-footed species ; as the 



Fio. 254.— Acorn-shells (Balanua) on Fio. 255.— Water-fleas : 1, Cyclops communit; 

 the Shell of a Whelk (Bucdmim). 2. Cypris tmi/aeaiata; 3, Daphnia pulex. 



