110 SPHENOPTERIS. 



Thyrsopteris inaquipinnata, Fontaine, 1 Sphenopteris Bunlurianus* 

 0. and M., and S. frag His, Heer. 



V. 2242. PL VI. Fig. 2. 



The figure of this specimen shows very clearly the general habit 

 of S. Fittoni. 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, 4 - Heer, or Scleropteris Pomelli, 5 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 pinna3 from the more basal part of a frond. Ecclesbourne. 



Eufford Coll. 



V. 2327. PL VII. Fig. 1. 



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 pinnse of 

 V. 2242. Ecclesbourne. Euford Coll. 



V. 23270. Woodcut, Fig. 10. 



Here the pinnules are still more divided, and the ultimate 

 lobes have a truncate appearance. Length of pinnule about 

 4 ram. The venation is shown with remarkable distinctness 

 and much more clearly than in the majority of the specimens. 



1 Potomac Flora, p. 142, pi. Ivii. figs. 3 and 8. 



2 Foss. Fl. Gond. vol. i. ser. ii. pt. ii. p. 78, pi. xxxii. This species is 

 described by Feistmantel as Hymenophyllites Bunburyanus (0. and M.). 



3 Fl. foss. Arct. vol. iii. 1875, p. 34, pi. ii. fig. 20. 



* Secc. Trab. Geol. Portugal, 1881, p. 13, pi. xi. fig. 6 ; pi. xv. fig. 8. 



Pal. Fran9. vol. i. 1873, pi. xlvi. fig. 1. 



