CLARK: CORRELATION OF PHYLOGENETIC SPECIALIZATION 313 



Calyx 



1 



1800-1900 16 28 



1900-2000 16 28 



2000-2500 16 28 



2500-3000 13 28 



Averaging all of the more primitive characters (in the columns 

 numbered 1) and all of the more speciahzed characters (in the 

 columns numbered 2) we get the following table. 



