32 INTBODUCTION. 



Anomozamites bifldn (Heer) = ? Nilssonia tenuinervis, Nath. 



Equisetites, sp. ; cf. Equisetites columnaris, Brongn. 



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



Ginkgo digitata (Brongn.) ~j 



G. Huttoni (Sternberg) 1= Ginkgo digitata (Brongn.). 



G. integriuscula, Heer } 



Pinus prodromus, Heer; cf. Czekanowskia Murrayana (L. & H.). 



Stenorrachis striolatus (Heer) ; cf. Ginkgo, sp. (male flower). 



A few plants which suggest the same geological horizon as that 

 of the Cape Boheman beds have been described also from Sassen Bay ; 

 the specimens referred by Nathorst to Nilssonia cf. oriental, Heer, 

 may be compared with the English species JV. tenuinervis, Nath. 



The Mesozoic plants obtained from Advent Bay and Cape 

 Staratschin in Spitzbergen belong to a somewhat higher horizon, 

 and bear a close resemblance to Wealden types ; they are probably 

 of uppermost Jurassic age. 1 



In a paper published in 1890 Schenk 2 describes a species of 

 Araucarioxylon and two species of Cedroxylon from the plant-beds 

 of Green Harbour ; the specimens were originally described by 

 Cramer under the generic name Pinites? 



2. SIBEKTA.. 



Among the Mesozoic floras of the far North the most important, 

 from the point of view of the distribution of Lower Oolite species, 

 is that which Heer has described from material collected by 

 Czekanowski, Hartung, and others. The principal localities at 

 which these Jurassic plants were discovered are TJst-Balei, in 

 latitude 51 N., about forty miles north of Irkutsk, the Upper 

 Amoor River, the Lena district, and elsewhere. 4 



Thyrsopteris Murrayana (Brongn.) % 



T. Maakiana, Heer f ? Coniopteris hymenophylloides 



Dicksonia clavipes, Heer I (Brongn.). 



D. arctica, Heer ' 



Asplemum whitbiense (Brongn.) = Todites Williamsoni (Brongn.) and (pars) 

 ? Cladophlebis denticulata (Brongn.). 



1 Vide Heer and Nathorst, loc. cit. 



2 Schenk (90). 



3 Cramer, in Heer (68). 

 * Heer (77 2 ) (78) (83 1 ). 



