00 M. YOKOYAMA. 



VIII, fig. 4, PI. IX, fig. 1, PJ. XII, fig. 15), or deeply lobed (PI. 



VIII, fig. 2a, 5, 6, PI. IX, fig. 2, PI. XII, fig. 14). Some are quite 

 entire and lanceolate with subparallel sides (PI. All I, fig. 2c, PI. 



IX, fig. 9, 10). Between these forms there are all sorts of grada- 

 tions, both in shape and in the depth of the central slit, just as in 

 our recent Ginkgo biloba. 



The lower margin of the leaf is thickened as in Ginkgo, but a 

 little more strongly than in the latter. The petiole, however, is very 

 short in comparison to the very long one of Ginkgo. The lower end of 

 the petiole which is the point of attachment to the stem, is slightly 

 expanded as is best seen in fig. 2a, PI. VIII, and fig. 5, PI. IX. 



As to the number of veins, they vary from 20 to 40, according 

 to the breadth of the leaf. In the lobed leaves 20-30 come in a lobe, 

 and in the lanceolate entire ones we find 30-35. For example a leaf 

 represented in fig. 9, PI. IX, which is 66 mm. long and 21 mm. 

 broad, possesses 30 veins with an equal number of interstitial veins, 

 and that represented in fig. 2c, PI. VIII, which is a little longer, has 

 35. 



Fig. 11, PI. VIII, representing a small leaf only 13 mm. in 

 breadth, shows 23 veins. 



In leaves of an oval shape (PI. VIII, fig. 14, PI. XII, fig. 

 15), the veins vary between 30 and 40. 



In all of our specimens, interstitial veins are more or less distinct- 

 ly observable and are always single (PI. VIII, fig. la, 11a, PI. IX, 

 fig. 10a). 



It is here to be added, that when the leaves are lobed they seem 

 to have been always two-lobed, the apparent anomalies seen in some 

 of the figures being only accidental. 



Very numerous at Shimamura, but rarer in other localities. 



Loc. — Shimamura, Yanagidani, Okamigo. 



