48 ART. 8. — H. YABE. 



NiUsonifi orientalis is also known from Japan and Siberia. 

 According to Prof. Yokoyama, it seems to be abundant in a 

 plant-bed exposed at Hakogase, Onogöri, pro v. Echizen, where 

 Dicksonia Glehniana, Onychiojysis elo7igata, Adianiites lancens, 

 Asplenium argutulum, A. distans., Sphenoplei'is sp., Podozamites 

 lanceolaius and Glnhgo cfr. lepida are also found. The Jurassic 

 deposit of Ajakit on the Lena^^ whence the species was first 

 recorded, contains, besides, Dichsonia gracilis, D. horeaUs, Rhizo- 

 carpiies singularis, Anomozami tes angulatus, Nilssonia comtula, 

 Podozamites lanceolaius, P. gramineus, Phoenicopsis ajigustifolia, 

 Ginkgo Huttoni, G. sibirica, G. integriuscula, Czekanowskia cre- 

 tacea, C. rigida and Pinus Nordenshjoldi. Recently, Nathorst"^ 

 described an identical or closely allied form from the southern 

 side of Sassen Bay, Spitzbergen ; the only other fossil associated 

 is Ptilozamites sp. 



According to present knowledge, the distribution of the species 

 of the genus Dictyozamiics is confined to India, Japan, Korea, 

 Bornholm and Yorkshire. A full account of the genus has been 

 very recently wTitten by Seward"^^ who has pointed out the uni- 

 formity of the general features of the Jurassic floras of these 

 widely distant places. 



From these localities, three or four species are already known. 

 The Korean and the Japanese fossils make a closer approach to 

 D. falcatus from India than to those from other countries. In 

 Japan, the species is found in the plant-bed of Ozö, pro v. Kaga 

 and Ushimaru, prov. Hida ; the associated fossils at the former 

 place have already been given above ; those at the latter are 

 Asplenium distans and Podozamites lanceolaius. 



1) Heer : Beitr. z. Juraflora Ostsibiriens u. d. Arnurlandes, p. 18. 



2) Nathorst: Znr Mesoz. Flora Spitzbergens, p. 24. 

 'S) Seward: Occurrence of Dichjozamltes in England. 



