INTEODUCTIOlf. 33 



A. argutulum, Heer \ 



A. distans, Heer ( cf. C. dentieulata (Brongn.)- 



A. Fetrusehinense, Heer ' 



Phylhtheca Sibirica, Heer ; cf. Equisetites columnaris, Brongn. 



Podozamites (several 8pecies founded on small fragments) ; cf. Podozamiles 



lanceolatus (L. & H.). 

 Paiera longifoUa{?omel) ) ^^ ^^.^^^ ^^^^_ 



(xmkgo lepida, Heer ) 



B. Czekanowskiana, Heer ; cf . B. gracilis, Bunb. 



Several forms of Ginkgo leaves, including numerous examples of <?. digitata referred 



by Heer to various species ; a few specimens resemble Cf. i^hitbiensis, Nath. 



Trichopitys setaoea, Heer; cf. Baiera Lindleyana (Schimp.). 



Czekamwskia rigida, Heer ) , v „ , 7 ■ ,, /t c tx ^ 



„ " ' > = (pars) Ozekanowskia Murrayana (L. & H.) . 



Anomozamites angulatus, Heer; cf. Mlssonia compta (Phill.). 

 Anomozamites Zindleyanus, Scbimp. = Anomozamites Nihsoni. 



In 1879 and 1881 Sdimalliausen ' published a memoir on the 

 Jura-Flora of Russia, in which he described plants from the coal- 

 basin of Kusnezk in the Altai Mountains, in West Siberia, from 

 the valley of the Petschora Eiver in North-East European Russia, 

 and from the lower Tunguska River in Northern Siberia. From 

 these regions he recorded certain species of plants indicative of 

 a Jurassic age, such as Oinkgo digitata, Cwkanowshia rigida, 

 Thyrsopteris prisca, Heer, and other ferns. It is, however, very- 

 probable, as Zeiller'' has shown, that these plant-beds should be 

 referred to a Permian horizon. The reasons for this conclusion 

 and the correctness of Schmalhausen's determinations are discussed 

 at length in Zeiller's paper. 



Eichwald' has recorded a few Jurassic plants from Kamenka 

 and other localities in Southern Russia : — 



Ahthopteris insignis = ? Cladophlehis dentieulata (Brongn.). 



Taniopteris vittata = T. vittata, Brongn. 



Zamites lanceolatus = Podozamites lamceolatus (L. & H.). 



Cyolopteris incisa, Eicb. = ? Ginkgo digitata (Brongn.). 



Sphenopteris prisca, Eich. ; cf. Coniopteris hymenophylloides (Brongn.). 



From Disco Island and from Kome on the north-west coast of 

 Greenland, Heer * has described numerous species, which indicate 



' Schmalhausen (79) (81). 

 2 Zeaier (96). 

 ' Eicbwald (68), p. 15. 

 * Heer (75) (83^). 



