JURASSIC PLANTS FEOM KAGA, HIDA, AND ECHIZEN. 29 



shape towards the upper part of the pinnae. As to the venntion, no 

 distinct median vein is observable, but the veins are fine, nearly equal 

 in size, and several times forking (fig. la) Pinnules of a pinna lying 

 in the middle of fig. 1 show dark spots around their margin, which 

 are probably due to the presence of fruit- dots. Each of these dots or 

 sori seems to have been borne on the tip of each lobe at the ends of veins 

 (fig. lb), just as in the recent Adiantums of the group of A. capillus- 

 veneris L. Therefore our plant, together with Adiantites Schmidtianus 

 Hr. (Beitr. zur Jura flora Ostsib. u. d. Amurl., 1876, p. 36, pi. II, fig. 12, 

 13), in which Heer observed a similar kind of fructification, very 

 probably belongs to the genus Adiantum. However as Dichsonia in a 

 fossil state sometimes shows quite a similar looking fructification, it 

 many be most prudent at present to refer our fossil to the provisional 

 genus of Adiantites Gup. 



This species may be compared to A. nympharum Hr. (Beitr. zur 

 Juraflora Ostsib. u. d. Amur!., 1876, p. 93. pi. XVII, fig. 5) which, 

 however, has obtusely lobed pinnules. 



Rather rare. Loc. — Shimamura. 



I may here notice that the pinnae figured as Adiantites amurensis 

 Hr. by Dr. Gey 1er (Foss. Pflanz, a. d. Juraform. Japans, p. 225, pi. 

 XXXI, fig. 2. 3) seem to possess pinnules, most of which are acute at 

 the apex and are quite different from those figured by Heer (see 

 Beitr. 1876, pi. XXI, fig. 6 ad). I doubt whether they do not belong 

 to Héerianus tn. although it cannot be positively decided, so imperfect 

 are the Geyler s specimens. 



10. Adiantites Kochibeanus m. 

 PL I, fig. 7, 7a. 



Fr)nd pinnated; pilinae elongated; pinnules alternate, acutely 

 directed forward, entire, broadly lanceolate, cuneate at base, acute at apex ; 



