132 SAGENOPTERIS 
In Velenovsky’s contribution to our knowledge of the Gymno- 
sperms of the Bohemian Chalk formation there are several figures 
of what he calls Thinnfeldia variabilis, Vel.; the characters dis- 
played by this species appear to me identical with those of the 
larger leaflets of Sagenopteris Mantelli. There is the same 
venation, the same form of leaflet, and an equally marked 
variation in shape and size: ef. Velenovsky’s figures! and Pl. IX. 
Figs. 4 and 5 of this Catalogue. 
Why the genus Zhinnfeldia, Ett., should have been chosen is 
a question not readily answered ; no mention is made of a resem- 
blance to Sagenopteris, and there is a great dearth of references 
and synonomy, which is apparently not unusual in this author’s 
paleobotanical contributions. The definition given of this 
Bohemian species, which is classed under the Gymnosperms as 
‘*species incertee sedis,’ describes correctly the characters of 
Sagenopteris Mantelli leaflets. The species is compared to Zhinn- 
Jeldia Lesquereuxiana, Heer ;* but this Greenland fossil has quite 
a different form, it shows a distinct midrib, and has no reticulate 
venation: the connection is not obvious. 
Hosius and Von der Marck® have figured a leaflet of Sagenopteris 
from the Neocomian Sandstone of the Teutoberger Wald under the 
name S. Neocomiensis, Hos. and V. d. Marck; this species closely 
resembles S. Mantelli, and differs only in having a more distinct 
midrib. 
A single leaflet from the Damuda series of India‘ also shows a 
close resemblance to the Wealden form; Feistmantel compares 
it to Sagenopteris rhoifolia, Presl. It is exceedingly difficult to 
arrive at any satisfactory results as to the limitation of the specific 
forms of Sagenopteris. . 
I have ventured to include under the Wealden species the 
Japanese fragments described by Yokoyama, as there are no 
apparent differences which suggest specific distinction. 
A new species has been recorded from Bornholm under the name 
S. Nathorsti, Barth.; there is a resemblance worthy of note between 
Bartholni’s fig. 9, pl. v.° and the lowest, broadly-lobed leaflet on 
the left-hand edge of Dunker’s fig. 4, pl. ix. 
1 Gymn. bohm. Kreid. pl ii. figs. 1-5. 
2 Fl. foss. Arct. vol. vi. pl. xliv. figs. 9-10. 
* Paleontographica, vol. xxvi. 1878, p. 210, pl. xliv. fig. 194. 
* Feistmantel, Foss. Fl. Gond. vol. iii. 1881, p. 114, pl. xliia. fig. 2. 
® Bot. Tid. Bot. For. Kjévenhayn, 1892. 
