2 Art. 8. — A. Kryshtofovich : 



Q. spathulatap etc. are decidedly not Cretaceous but Paleogene, 

 though Miss Stopes recently took them for Neocomian,^^ as did 

 EiCHWALD. But the single specimen of Platanus cf. Heeri, reported by 

 KoMANOWsKY^^ from Western Turkestan, is doubtless Cretaceous ; 

 though that leaf was quite erroneously regarded by Prof. Sewakd^^ 

 as belonging to the Jurassic fern Clathr opter is. The first treatment 

 of a more complete and well preserved flora of Cretaceous (Ceno- 

 manian) Angiosperms from the Ural Province was recently announc- 

 ed by the present author/^ as follows : 



Pteris frlgida He. ? 



Asplenium Dicksonlanum He. 



Finns Quenstedtii He. ? 



Platanus {Credneria) Geinitziana Ung. 



P. {Cr.) Velenovskyana Keass. 



P. (Cr.) cuneifolia Beonn. 



Platanus sp. 



Zizyphus dakotensis Lesq. 



Cissites uralensis Keyset. 



Sterculia Vinokurovii Keyset. 

 But I have now come to the conclusion, that besides these 

 scarce materials, many luxuriant Cretaceous floras from Siberia 

 have for a long time been regarded as of the " Tertiary " and 

 " Miocene." Most of these have not been revised since the first 

 pubhcation, notwithstanding the great progress in Paleobotany. 



The most important work on these fossil floras appears to be 

 the " Miocene Flora der Insel Sacliahn," in which Heee (1878) 

 described a mixture of Tertiary and Cretaceous plants as alto- 

 gether Miocene. 



1) Eichwald (1865), p. G2, 63, pi. Ill, f. 9, 10, 11. 



2) Stopes (1913), p. 196. 



3) EoaiANOwsKY (1890), vol. in, p. 139-141. 



4) Seward (1907), p. 43. 



5) Keyshtofoyich (1914), jî. G03. 



