BY ROBERT HALL. 



329 



The values of portions of the preceding tables are 

 shoAvn in the following comparative table of genera and 

 species : — 



TABLE OF RELATIVE VALUES. 



Genera in Table I. Table 11. Table III. 



Areas S12345679 812345679 812345679 



Species in Table I. Table II. Table III. 



Areas 812345679 812345679 812345679 



