28 AllT. y. M. YOKüYAMA. 



At all events, even granting that these two si^ecies are distinct, 

 it would l^e impossible to distinguish them, if the specimens 

 existed only in imperfect fi-agments, so alike are they in appearance. 

 An example represented in fig. 8 shows four lobes, one of 

 which is again split into two, each of which measures about 



3 mm. in breadth. The three others ai-e all simple and possess 

 about the same breadth as the other two. The len2;th in the 

 one at the extreme right, in which the apex is well ])reserved, 

 is about 15 mm. The others which all lack the apex seem to be 

 a little longer. The veins are indistinct, but appear to number 



4 or o. 



A fragment represented in fig. 7 shows only two lobes, one 

 of which is again sj^lit into two by a shallow incision. The lobes 

 are all apically rounded, and measure not quite o mm. in breadth. 

 Their length is not known as their basal ]^ortion is broken off. 

 The veins are again indistinct. 



Fig. represents another isolated lobe partly split into two 

 blunt loblets which are about o mm. in breadth. Its shape is 

 slender in comparison with those of the typical form. 



L- Nien-tsu-kou, Sai-ma-chi, 

 Shêng-ching-Shêng.' ' 



1. TODITES WILLIAMSONI (liii >v(;n). 



PI. YIII. Fig. 1. 



Tiiere are several S2)lendid specimens of this world-wide fern 

 which I have already described from 8su-ciruang. They all be- 

 long to the sterile pinna- which, howevei", show all the charac- 

 'teristics of the bi)ecies. 



1) ^jiit^&îfc^^iiV^ 



