22 M. YOKOYAMA. 



2. Description of the Species. 



Class 1. Cryptogamae. 



Order 1. Filicaceae. 



Fam. 1. Polypodiaceae. 



1. Thyrsopteris Kze. 



1. Thyrsopteris Murrayana Brgt. sp. 

 PL XII, fig. 5. 



Thyrsopteris Murrayana — Heer, Beitr. zur Jura -flora Ostsib. u. d 

 Amurl., 1876, p. 30, pi. I, fig. 4, II, 1-4, VIII, 116. Beitr. 1878, 

 p. 1, pi. I, fig. 6. Nachträge, p. 6, pi. I, fig. 1. 



Pecopteris Murrayana — Brongniart, Veget. Foss. I, p. 358, pi. 

 CXXVI, fig. 1, 4. 



Sphenopteris Miirrayana — Zigno, Enum. Fi lie. Eoss. Oolith., p. 20. 



Hymenophyllites Murrayana — Zigno, Flora Foss. Form. Oolith., p. 

 92. 



Tympanophora racemosa — Lindley and Hutton, Fossil Flora of 

 Great Britain, vol. Ill, pi. 170. 



Coniopteris Murrayana — Schimper, Palaeont. Veget., vol. Ill, 

 p. 471. 



This species ocurs only in small fragments, one of which I have 

 here figured. It is distinguished from its closely related species, 

 Thyrsopteris prisca Eichw. in having the tertiary veins simple. The 

 discovery of undoubted, though fragmentary, specimens of this plant 

 in Japan is very important, as it not only occurs in Siberia, but has 

 already been described by Brongniart and Lindley from the Oolitic 

 flora of Yorkshire. Loc. — Okamigö. 



