Some Remarks on the Cretaceous Fossi 

 Flora and the Causes of Extinction. 



By 

 K. Fujii. 



This paper is intended to supplement the preceding article 

 by Dr. Y. Suzuki, and at the same time to give some remarks 

 on the Cretaceous fossil plants in general, with which we 

 are concerned. 



The knowledge of the Mesozoic plants based on the internal 

 structure is now rapidly increasing.— The well known mono- 

 graph by Wieland has disclosed exceedingly important features 

 of Cycadophyta. Jeffrey's and Hollick and Jeffrey's works 

 unveiled before us the real natures of several groups of plants 

 from the Middle Cretaceous. StopES and Fujii have been work- 

 ing on the flora of the Upper Cretaceous of Japan, and at first 

 some 17 species, which contained a Fungus, 2 Ferns and a 

 fern root, a Cycadian leaf, 7 Conifers, 5 Dicotyledons and a 

 Monocotyledon were described (Stopes and Fujii, 1910). Later 

 Stopes (1910) added Nilsonia orientalis, and Stopes and 

 Kershaw (1910) Prepinus japonicus Stopes et Kershaw 

 and Pinus yezoensis Stopes et Kershaw to the list. In the 

 foregoing pages Suzuki added further the three new species, 

 Abiocaulis yezoensis, Cryptomeriopsis mesozoica, and Pleospo- 

 rites Shirainus. 



When Dr. Marie Stopes and mjself were jointly working 

 on the flora of this period, Abietineous members were repre- 

 sented, if any, only by 2 kinds of Cedroxyla ; the true genus 

 or genera to which they belonged, were naturally difficult to 

 determine. Now we have Prepinus, Pinus, and Abies, so that 

 we have a little better idea of the vegetation of the geological 

 day of our Upper Cretaceous. The discoveries of these genera 

 by Stopes, Kershaw, and Suzuki are of an importance for 



