No. 475] REVISION OF COMPTONIA 



489 



of Westphalia. This species shows a considerable progression 

 from the earlier Cretaceous form, and clearly foreshadows the 

 later type of leaf, so abundant in the Tertiary floras, and which is 

 not very different from the typical modern leaf. 



With the ushering in of the Eocene, we find this type of leaf con- 

 tinued in considerable abundance and showing more or less varia- 

 bility in the direction of other species. The European records 

 of this age are far superior to those of America; while the Arctic 

 region unfortunately has thus far furnished no cvidciicr except 

 for the single leaf which I have referred to Com pioDtu in lrn>j)li i/lhi 

 and whose age is doubtful). 



The Atlantic coastal plain, where we would exp.'. t t.. have 

 found a most intereMii^' -nmp of -peeie.. Imd rl,e ,■<■.•,, nU only 

 been preserved, fails ii> eiiiii-elv, a-- no leaf l>eiU have Ix^'ii found 



velve forms which t 



