On the Cretaceous Flora of Russian Sakhalin. 39 



a Tertiary form, has not yet been mentioned anywhere by another 

 name. However, with this form N. Jonstnipii Hr.^^ in the Atane 

 bed is surely closely allied, differing only by a larger size and a 

 more entire lamina ; this species has also been recorded from the 

 Eyöseki Series of Japan by Yokoyama.^^ Another affinité type, 

 Nilssonia holiemica Yel.^^ from the Peruc clays is not so large, but 

 has a more entire lamina. A more distant resemblance is shown 

 in the common Wealden and Neocomian species, N. schaumhurgensis 

 (DuNK.)*^ Nath., bearing a narrow and poorly segmented lamina. 

 To the same genus may belong the plant, described by Dawson 

 from Nanaimo, as Macrotœniopterîs vancouverensis Daws.^-" The 

 genus Nilssonia, taking its origin in the Lower Mesozoic, is still 

 quite common in both the Lower and Middle Cretaceous ; but its 

 occurrence in younger formations is more scanty and belongs often 

 to regions which are geologically not well studied. ^^ Although its 

 occurrence, confirmed anatomically in the Upper Cretaceous of 

 Japan, is beyond any doubt, some leaf impressions, very similar 

 to our Sakhalin species, were kindly shown me by Prof. Yabe from 

 his collection, made long ago, near the Yobari Coal mine in the 

 province of Ishikari, Hokkaido ; it is from the Lower Division of 

 the " Freshwater Tertiary," which is also Uppermost Cretaceous. 



Piecords of Tertiary Nilssonia seem to be always without 

 foundation. But the great authority of the famous paleobotanist 

 Heer caused some botanists to believe, that Nilssonia, occurring so 

 late as in the " Tertiary " of Sakhalin, may have still found asylum 

 somewhere in the wilderness of south-western China, as have many 



1) Heee (1882), p. a, pi. VI, f. 1-6. also K Gihbsii Newbeery (1898), p. 16, pi. XV, f. 2. 



2) YoKOYAMA (1894), p. 226, pi. XXV, f. 1-4. 



3) Velenotsky (1885), p. 11, pi. Tl, f. 2.5-28. 



4) DuNKEE (1846), p. 15, pi. I, f. 7 ; H, f. 1 ; VI, f. 5-10. 



5) Dawson (1893), p. 55, pi. V, f. 1, 2, 3. 



6) Dawson (1883), p. 24, pi. IV, f. 15 bis. 15 a. 



