SPHENOPTERIS. WAU 
The figure gives the impression of a filmy fern, and in the 
light brown stain on the rock surface, representing the leaf 
lamina, we have just that kind of imprint which might be looked 
for in a Hymenophyllaceous type of fern. Attention has already 
been called to the danger of trusting too much to such resem- 
blances, which are frequently nothing more than expressions of 
Fia. 10 (V. 2327a). Enlarged 4 times. 
the different effects of the diversity in texture and porosity of the 
rock matrix. The single pinnule shown in the woodcut agrees 
very closely with one figured by Potonié! in a Carboniferous fern, 
Sphenopteris Haninghausi, Brong., var. Larischiformis, Pot.; but 
it is not for a moment suggested that the two species have any 
natural affinity whatever. Ecclesbourne. Rufford Coll. 
V. 2162. Woodcut, Fig. 11. 
Probably a pinna from the basal portion of a frond. Pinnules 
ovato-lanceolate and lobed. The venation is fairly distinct, but, as 
is usually the case with carbonaceous impressions on clay, not nearly 
Fie. 11 (V. 2162). Enlarged 3 times. 
so well marked as on the ironstone. The figure shows a median, 
and less marked lateral veins. Some of the pinnules in Fitton’s 
type specimen correspond fairly closely with those represented in 
1 Jahrb. k. preuss. Geol. Landesanst, 1890, p. 23, pl. vii. 
