380 



MISS M. C. STOPES OHf THE ELOKA 



[Aug. 1907, 



from the living one, for, as Prof. Seward says (op. cit. p. 259), 

 they can 



* be matched exactly with some of the smaller leaves of the recent species.' 

 Few fossil-leaves have excited more interest than those of Ginkgo ; 

 and while, on the one hand, innumerable specific names have been 



Epidermis-cells of living and fossil Ginkgo. 



Ginkgo digitata (fossil). 



A = Epidermis of the lower side of the leaf of Ginkgo digitata, Jurassic, showing 

 stomates ; B= Epidermis of* the upper side of the same leaf ; C=Lower 

 epidermis of Ginkgo biloba (living), showing stomates ; D = Upper 

 epidermis of the same leaf. [Note the difference in form between the 

 cells of the two species.] 



given to all the varieties of external form among the fossils, on the 

 other it has been held that the Jurassic species may be identical 



