90 



LIFE ON THE EARTH. 



3 



o 



I 



11 



II 



^ a 



p-^ V2 



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-fi 



II 



Polyzoa, or Bryozoa. These abnormal, often 

 compound mollusks, in their mode of growth and 

 membranous or stony parts much resembling Zoo- 

 phyta, occur in all the groups of Strata, and except- 

 ing Reteporidse, which are almost confined to Palseo- 



