INTRODUCTION. XXXV 



From the Cretaceous flora of Niederschona in Saxony, Engel- 

 hardt 1 has recently recorded this same species, Sphenopteris 

 Mantelli, Brong., but unfortunately he does not give figures of 

 any of the specimens. 



J$o 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 2 and the strata, presumably of the same age, of 

 Columbia, South America, described by Major Plant, 3 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 ; (iii) 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. 



2 Ann. Soc. Espan. Hist. Nat. vol. vii. 1878, p. 87. 



3 Proc. Lit. Phil. Soc. Manchester, vol. xvi. 1877, p. 50. 



