CONCLUSION 311 



Lastly, there is the question of the relationship between 

 different phyla of the animal kingdom. Enough has been 

 said, in the proper places, to show that there is some evidence 

 of relationship between the MoUusca and the Chsetopoda, or 

 the Chaetopoda and the Arthropoda, not to mention other 

 examples. But, in the opinion of the author, these questions 

 do not properly fall within the scope of an elementary work, 

 and should rather form the subject of advanced studies. 



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