110 SPHENOPTERIS. 
Thyrsopteris inequipinnata, Fontaine,’ Sphenopteris Bunburianus,? 
O. and M., and S. fragilis, Heer. 
V. 2242. Pl. VI. Fig. 2. 
The figure of this specimen shows very clearly the general habit 
of S. Hittoni. The venation of the pinnules cannot be made out in 
the figured specimen, which is in the form of a thin carbonaceous 
impression on a clay matrix; in the ironstone specimens the 
venation is often remarkably distinct. 
The shape of the pinnules is very similar to that in S. pluri- 
nervia,* Heer, or Scleropteris Pomelli,’ Saporta, but the resemblance 
is confined to details, rather than pointing to a close agreement 
of the ferns as a whole. 
The pinnules of the lower part of the frond shown in the figure 
have distinctly serrate or lobed margins. This character becomes 
much more pronounced in other specimens, which probably repre- 
sent pinne from the more basal part of a frond. LEcclesbourne. 
Rufford Coll. 
WViigeer. El. VOL. wie, Al. 
This specimen is preserved on a fine-grained ironstone, and 
shows the details of the pinnules much more clearly than V. 2242. 
So far as it is possible to arrive at a conclusion from the available 
material I am in favour of including this and similar specimens 
with those of the form represented in Pl. VI. Fig. 2. The greater 
lobing of the ultimate segments is probably merely an extension 
of the marginal indentations referred to in the lower pinne of 
V. 2242. Ecclesbourne. Rufford Coll. 
V. 2327a. Woodcut, Fig. 10. 
Here the pinnules are still more divided, and the ultimate 
lobes have a truncate appearance. Length of pinnule about 
4 mm. The venation is shown with remarkable distinctness 
and much more clearly than in the majority of the specimens. 
1 Potomac Flora, p. 142, pl. lvii. figs. 3 and 8. 
2 Foss. Fl. Gond. vol. i. ser. ii. pt. ii. p. 78, pl. xxxii. This species is 
described by Feistmantel as Hymenophyllites Bunburyanus (O. and M.). 
3 Fl. foss. Arct. vol. iii. 1875, p. 34, pl. ii. fig. 20. 
4 Sece. Trab. Geol. Portugal, 1881, p. 13, pl. xi. fig. 6; pl. xv. fig. 8. 
5 Pal. Frang. vol. i. 1873, pl. xlvi. fig. 1. 
