JUEASSIC PLANTS FROM KAGA, HIDA, AND ECHIZEN. 57 



which is thickened at its margin and gradually passes into a short petiole. 

 Veins numerous, simple, parallel: interstitial veins very f ne. 



The leaves which I am going to describe below under this 

 genus, I brought under Baiera in the Bulletin, But now I have 

 reason to believe that they must be treated as a distinct genus, relat- 

 ed on one side to Ginkgo and on the other to Baiera. With the 

 former it has in common the thickening of the lower margin of the 

 leaf and with the latter the numerous, simple, parallel longitudinal 

 veins. But these veins coming down directly on the thickened mar- 

 gin without converging, decidedly distinguish oar plant from the two 

 above named ones. This mode of venation may be compared to that 

 of Whittleseya Netub. from the Coal- Flora of Pennsylvania (Les- 

 quereux, Descript. of the Coal-Flora of Pennsylvania, 1880, vol. I, PL 

 IV). 



The discovery of this genus standing between Ginkgo and Baiera 

 shows more strongly the close relationship existing between these 

 genera which was first pointed by Heer (Beitr. z. Juraflora Ustsib. u. 

 d. Amurl., 1876, p. 51). 



38. Ginkgodium Nathorsti m. 



PI. II, fig. 4e. PI. Ill, fig. 7. PI. VIII. PI. IX, fig. 1-10. 



PI. XII, fig. 14, 15. 



Leaf coriaceous, gradually attenuated below into a short petiole, entire 

 or lobed ; apex obluse. Longitudinal veins dense, simple, parallel ; in- 

 terstitial veins very tine, simple. 



The leaves which I mentioned in the Bulletin (page 8) as three 

 new species of Baiera, 1 now unite into one, as I was convinced by 

 the examination of many specimens that an apparent diversity in the 

 shape of the leaves is merely a variability. Some leaves are broad and 

 more or less narrowly fan-shaped, and are nearly or quite entire (PI. 



