INXRODUCTIOX. 33 



A. aryutulum, Heer \ 



A. distant, Heer ' cf. C. denticulata (Brongn.). 



A. Petruschinense, Heer / 



Phyllotheca Sibirica, Heer ; cf. Eqmsetites eolumnaris, Brongn. 

 Podozamites (several species founded on small fragments) ; cf. Podozamites 

 lanceolatus (L. & H.). 



Baiera lonqifolia (Pomel) ) , -n -m-u- XT it 

 ' > cf. Baiera Philhpsv, Mth. 

 trtnkgo lepida, Heer ; 



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



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

 by Heer to various species ; a few specimens resemble G. whitbiensis, Nath. 

 Trichopityx setacea, Heer; cf. Baiera Lindkyana (Schimp.). 

 Czekanowskia rigida, Heer j = ( } Czekmowsk{a Murrayana (L . & H .). 

 C. setacea, Heer 



Anomozamites angitlatus, Heer; cf. Nllssonia compta (Phill.). 

 Anomozamites Lindleyanus, Schimp. = Anomozamites Nilssoni. 



In 1879 and 1881 Schmalhauscn l 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 River 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 Ginkgo digitata, Czekanowskia rigida, 

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

 probable, as Zeiller 2 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 3 has recorded a few Jurassic plants from Kamenka 

 and other localities in Southern Russia : 



Alethopteris insignia = ? Clodophlebis denticulata (Brongn.). 



Tceniopteris vittata = T. vittata, Brongn. 



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



Cyclopteria incisa, Eich. = P Ginkgo digitata (Brongn.). 



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



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

 Greenland, Heer 4 has described numerous species, which indicate 



1 Schmalhausen (79) (81). 

 1 Zeiller (96). 

 s Eichwald (68), p. 15. 

 Heer (75) (83 s ). 



