244 M. YOKOYAMA. 



A glance at the plate with show th;it a great resemblance exists 

 Ijetween this species and Thaumatopicris M'dnstcri vav. ahhreviata Gopp. 

 (Scliimper, Traité de Paléont ^éget, vol. I, pi. XL, tig. 7) from the 

 Ivhaîtic (3f Franconia. kS(j great is tlxis resemblance, that I was at 

 tirst inchned to treat the two species as identi'-il ; but a careful 

 comparison between Schimper's figure and many tens of specimens 

 at hand seems to show that the secondary veins in (jur plant are 

 not so strong and rigid as in the European. J^esides, none of our 

 specimens had the lol^es linear and tinger-like as in the figure of 

 Schimper, 1)ut always had tliem m(3re or less triangular. Under these 

 circumstances, I deem it more advisable to treat it as a new species. 



DictijophijUum japouicuiii is also not indike Camptoptcrts serrata 

 Kurr (Xathorst, Floran vid Bjuf, pi. A', fig. o) in the general appearance 

 of its pinna?. Ihit the latter is said to have very indistinct sec(jndary 

 veins. 



A Spiropteris shown in fig. 5, pi. XX XH', I believe to belong to 

 DictijnplniUum japuiiicmii^ as it was found in the lowest fossil horizon, 

 where no other species occur. 



4. Dictyophyllum Koehibei //. sp. 

 VI XXXIX, lig. 1, la. 



Pinnœ elongated, deeply pinnatifid ; pinnules ovate or ovately 

 lanceolate, crenate at margin, obtusely pointed at apex, passing off 

 either at ri^dit angles from the rluichis, or sliglitly inclined forward. 

 Khachis moderatelv strong ; secondary veins (piite distinct, somewhat 

 zio-za"', one in each lobe ; tertiarv veins also distinct, forming- by their 

 union two to three rows of irregularly polygonal nets ; (piaternary 

 veins very fine, forming secondary nets within the [)rimary ones. 



fJudii'ing from the size of the rhachis and the weaker impression 



