22 AET. 8. H. YABE. 



to 0. elongata. All of these species closely resembling one an- 

 other, it is sometimes questioned whether 0. elongata is really 

 distinct from 0. caiisulifera on the one hand or from 0. 3Jantelli 

 on the other. More recently, Seward'^ has united 0. elongata 

 with 0. 3Iantelli. 



In short, Onychioj)si8 is a genus ranging from the Jurassic 

 to the oldest part of the upper Cretaceous and is of a wide 

 geographical distribution, and of the 4 species known, 0. elongata 

 seems to have the greatest chronological range. 



ONYCHIOPSIS ELONGATA (Geylee). 

 PL L, figs. 9-14; pi. III., fig. 15. 



1871. Spheno2:)teris Geopperti Schenk (in part) : Palœonto- 



graphica vol. XIX., pi. XXX., figs 2 and 2a. 

 1877. lliyrsopteris elongata Geyler : Ueber Foss. Pflanzen 



a. d. Juraform. Japans. P. 224, pi. XXX., fig. 



5 ; pi. XXVI., figs., 4 and Ö. 

 ? 1883. Thyrsopteris elongata Schenk : Pichthofen's China. 



Vol. IV., pt. X., p. 263, pi. LIV., fig. 1. 

 188G. Dicksonia elongata Yokoyama : On the Jurassic Plants 



of Kaga, Hida and Echizen. Bull. Geol. Soc. Japan. 



Pt. B. Vol. I., no. I., p. 6. 

 ? 1889. Thyrsopteris rarinervis Fontaine : The Potomac or 



Younger Mesozoic Flora. P. 124, pi. XX VI., figs. 



6, 7 ; pi. XLIIL, figs. 4-6 ; pi. XLIV., figs. 1, 2 



and 5; pi. XLIX., fig. 2; pi. CLXIX., figs. 6, 7. 



1) Sewakd : Fossil Flora of Cape Colony, 1903, p. 5. 



