XXXIV INTRODUCTION. 
Polypodium Hochstettert.. The formation from which these were 
collected is spoken of as probably Wealden in age.! 
The preceding sketch is by no means intended to convey the 
idea that all the plant-bearing beds referred to are probably 
of Wealden age. 
A more critical and detailed comparison of the species men- 
tioned in the above lists will be made after the descriptions of 
the English specimens have been completed. Very possibly some 
of the plants which have been quoted as Jurassic in age may 
have to be correlated eventually with the typical Wealden 
floras; but in this introductory review there have simply been 
given those plant lists which include species of undoubted 
Wealden affinities, or, in other words, of which Wealden floral 
elements form a more or less conspicuous part. The plants 
described by Bartholni? from Bornholm are spoken of as Jurassic 
in age, but it seems not at all unlikely that the evidence will 
be found to be rather in favour of a Lower Cretaceous 
horizon. It may be found that Wealden plant beds are also 
represented in Sweden; at least one characteristic species, 
Weichselia Mantelli (Brong.), has been recorded from Swedish 
strata. 
There are other records of plants to which allusion might be 
made as including at least one Wealden species, but it may 
suffice to mention two instances. In a notice by Tate in the 
Journal of the Geological Society for 1867 there is a plant 
figured under the name Sphenopteris antipodum, Tate,’ from the 
Geelhoutboon beds in the Uitenhage series (Lower Cretaceous) 
of South Africa. This fossil is compared by the author of the 
species to Sphenopteris Juglert, Ett., but there appears to be a 
much closer resemblance to Onychiopsis (Sphenopteris) Mantelli 
(Brong.), and, indeed, I have decided to include Tate’s fragment 
under this characteristic Wealden species.‘ 
' Reise Fregatte Novara, vol. i. Abth. ii. p. 1. 
* Bot. Tid. Bot. For. Kjévenhavn, vol. xviii. Heft i. 1892, p. 12. 
$ Quart. Journ. Geol. Soc. vol. xxiii. 1867, p. 146. 
4p. 44. 
