14" DEFINITION OF THE TERM INSECT. 



though connected with the Vertebrata by having a heart 

 and circulation. 



His next set of circles shows the sub-division of these 

 five sub-kingdoms into classes — Thus : 



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In this scheme the osculant classes are those placed 

 between the circles. In the Mollusca circle two classes 

 are still wanting to complete the quinary arrangement 

 of that sub-kingdom. I am not sufficiently conversant 



