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Frank Benton. 



Explanation of Plates XIX and XX. 



All figures, except diagrams Nos. 1 and 2, are from camera lucida drawings, 

 made at the base of the microscope. Figures 5 to 166 were made by using a V and 

 S4 ocular and a xV oil immersion. Each one of these drawings is enlarged 875 

 diameters. 



