20 AKT. 9. — M. YOKOYAMA. 



near the base measures 2") to 2(S niillimeters. The veins, which 

 are slightly divergent and therefore run more or less to the 

 margin, dichotomize here and there and again anastomoze, thus 

 forming a network of meshes much elongated transversely. The 

 number of veins is about 12 in the space of a centimeter. 



In general aspect, this fern resembles Ctenis Zeu^chnerl 

 Raciboeski (Flora Kopalna, p. 01, pi. XVI) from the Jurassic 

 of Poland, but the latter possesses much closer veins, there being 

 16 to 24 in the space of a centimeter. Qenis remotinervis 

 RaciboPvSKi (ibid., p. 59, pi. XVIII, fig. 2), also from the same 

 place, i-esembles the Chinese form in the number of the veins 

 (8 to 12 in the space of a centimenter), l)ut the nets seem to 

 be much shorter. 



4. PODOZAMITES LANCEOLATUS (Lindl). 

 PI. VI. Fig. lb, 2. 



There are several isolated leaflets of this plant, some of 

 which are very long and narrow. Tiie one shown in the figure 



(1 b) has about Id veins. 



« 



K. Lao-tung-ts'ang, Hsüan-hua-Fu, 

 Chih-li-Shêng." 



1. CONIOPTERIS HYMENOPHYLLOIDES (Brongx.). 



Pi. VII. Figs. 1-5. 



Coniopferk hpnenophylloides Sicward, The Jurassic Flora, p. 99, pi. X^^I, 

 %s. -4-0, XVII, 3, 6-8, XX, 1, 2, XXI, 1-4. 



The species which has been already described from Fang-t'u 



ij mr^'È.'^}ii'^Ai^(mt.\wo^ii) 



