MESOZOIC PLANTS FIlOM KOREA. 2U 



tiou also to Dicksonia ; Seward/^ however, brought it within the 

 synonyms of Goniopteris hymenophylloides with a query. 



The sterile pinnae of this species are so much like those of 

 Dicksonia acutiloba,'~^ D. concinna^^ and D. Saportcmci^^ from the 

 Jurassic Deposits of eastern Siberia, that the writer at first 

 hesitated to separate it from any of those species. But the dis- 

 tinctly contracted base of the pinnules and other minute differences 

 led him to make it separate from the Siberian species. Among 

 the Potomac plants, there are also many species allied to the 

 Japanese, such as Thyvmiiieris ellipiica Fonïaine,^^ T. varlaiis 

 Fontaine*'^ and T. crenata Fontaine,"' none of which however 

 seems to be quite identical with it."*^ 



CONIOPTERIS HYMENOPHYLLOIDES (Brongniart) ? 

 PI. IL, fig. 8 ; pi. III., fig. 8. 



1851. Sphenopteris nephrocarpa Bünbury : On Some Fossil 

 Plants from the Jurassic Strata of the Yorkshire 

 Coast. Quart. Jour. Geol. Soc. London. Vol. VIL, 

 ph XIL, figs, la, b, p. 179. 



1) Skwabd : Jurassic Flora, p. 100. 



2) Heer: Beiträge z. Jura-flora Ostsibiriens vi. d. Amurlandes, p. 92, pi. XVIII., fig. 4. 



3) Heer: 1. c. p. 34, pi. XIV., fig. 6; p. 87, pi. XVI., figs. 1-9. 



4) Heer : 1. c. p. 89, pi. XVII., figs. 1, 2 ; pi. XVIIL, figs. 1-3. 



5) Fontaine: Potomac Flora, p. 133, pi. XXIV., fig. 3; pi. XLVI., fig. 1; pi. L., 

 figs. 6, 9; pi. LL, figs. 4, 6, 7; pi. LIV., fig. 6; pi. LV., fig. 4; pi. LVI., figs. 6, 7; pi. 

 LVII., fig. 6 ; pi. LVIII., fig. 2. 



6) Fontaine: 1. c. p. 137, pi. LIL, figs. 2-4; pi. LIL, figs. 1-3 j pi. LIV., fig. 10; 

 pi. LVII., fig. 2. 



7) Fontaine: 1. c. p. 127, pi. XXXIX., figs. 1-2. 



8) In a piece of shale with a sterile frond of the species, there is an impression which 

 looks as if it were a portion of a tree fern stem 3.5 cm. in length and 2.5 cm. in breadth. 

 It shows an obliterated surface only, the vascular bundles being not quite recognizable. 

 Tlie petiole bases are arranged in close spirals. 



