eo 
4 Seward: The Jurassic Flora of Yorkshire. 
European regions. It is almost certain that the Jurassic 
species differed also in structure from their modern descen- 
dants, but this is one of the many questions which can be 
settled only with the help of petrified specimens. 
LycopopiALEs. (Lycopodites falcatus Lind. and Hutt.). 
The species Lycopodites falcatus, though represented by sterile 
fragments only, may be regarded as closely related to the 
recent Lycopods and Selaginellas, plants still met with in many 
Fic. 1.—Cladophiebis denticulata Brongn. Froma specimen in the)British 
Museum, from the Inferior Oolite of Yorkshire. Slightly reduced.* 
parts of Britain, but more abundant and much richer in species. 
in warmer countries. 
FILIcALES. [.—FERNS OF UNCERTAIN POSITION. The three 
species, Cladophlebis denticulata Brongn, C. haiburnensis Lind. 
and Hutt, and C. lobifolia Phillips, are referred to Brongniart’s 
genus because we have as yet no very satisfactory evidence as 
to the precise nature of the fertile specimens of any of them. 
The name Cladophiebis is essentially a provisional title which 
implies ignorance as to the family position of the species so: 
* Block lent by the Syndics of the Cambridge University Press. 
Naturalist, 
