On the Cretaceous Flora of Eussian Sakhalin. 



33 



Recently Bebry,'^ taking together many of Fontaine's original 

 types from the Potomac, tried to include the present species in the 

 widespread Mesozoic type Cladophlehis Browniana Dunk, sp., whose 

 figures in his last work (t. XXIX, f. 1, 2) quite coincide with our 

 fern. But owing to the lack of sufficient material in hand, I can 

 not confirm the full identity of C. Broicniana in its original type 

 with P. virginiensis Font. ; P. cf. vircjiniensis was also recorded 

 by Prof. YoKOYAJLr^ in the Lower Cretaceous of Awa province, 

 together with a typical specimen of C. Browniana, which was ob- 

 served in the Potomac Group including the Patapsco Formation, 

 also in the Neocomian of Japan and the GyHakian of SakhaHn. 



Fig. 3. 

 Pteris frigida Heee. 



8. Pteris frigida Heee. 



1882. Heee, Die fossile Flora Grönlands, I. Tbeil, p. 

 3 and 25, pi. II, f. 13; VI, f . 5 b ; X, f. 1-4; 

 XI ; XII, f. 2 ; XIII, f. 2 ; XVII, f. 2 ; XVIII, 

 f. 10 b. 



1883. Heee, Die foss. Fl. Grönlands, II. Tbeil, p. 51, 

 pi. CII, f. 8, 8 b. 



1888. Velenovsky, Die Farne der böbm. Kreideforni., 



p. 14, pi. IV, f. 1-4. 

 1914. Keyshtofovich, The discovery of tbe xVno-io- 



sperm Flora in tbe Cretaceous of Ural Province, 



p. 605, f. ]. 



Locality : Sea-shore at Mgacb. 



This typical fern, with large dentate seg- 

 ments in well developed specimens, was found 

 abundantly at Mgach. 



The lateral nerves of segments fork only 



1) Beekï (1911 b), p. 321. 



2) YoKOTAMA (1894), p. 220, pi. XXIV, f. 1. 



