INTRODUCTION. XXXV 
From the Cretaceous flora of Niederschdna in Saxony, Engel- 
hardt' has recently recorded this same species, Sphenopteris 
_ Mantelli, Brong., but unfortunately he does not give figures of 
any of the specimens. 
No mention has been made of those countries or districts in 
which fossiliferous strata have been described containing only 
animal fossils, but which are probably homotaxial with typical 
Wealden strata. The supposed Wealden rocks of Spain described 
by Linares* and the strata, presumably of the same age, of 
Columbia, South America, described by Major Plant,’ afford 
instances of such fresh-water beds. 
In the Second Part of this Catalogue it is intended to com- 
plete the description of the English Wealden plants. We shall 
then be in a much better position to deal with such general 
questions as (i) the distribution of Wealden plants throughout 
the world; (ii) the value of such plants as evidence of geologic 
age; (111) the Wealden climate; (iv) the relation of the Wealden 
flora to the vegetation of earlier and later periods. 
1 Abh. Isis. Dresden, 1891, p. 79. 
? Ann. Soc. Espa. Hist. Nat. vol. vii. 1878, p. 87. 
3 Proc. Lit. Phil. Soc. Manchester, vol. xvi. 1877, p. 50. 
