BY A. B. WALKOM. 



73 



The outstanding feature of this flora is the large increase in 

 the number of cycads. Other noticeable points are the decided 

 decrease in the number of species of Ginkgoales, and the presence 

 of a few Conifers. 



Arranged in tabular form, and omitting from iht'Tshle Schizo- 

 neura sp., which may possibly be the external casts of which 

 S. sp. a is the pith-cast, and also Fhamicopsis elongat2i,s, whose 

 position is quite unknown, the following result is obtained. 



Table iv. 



This Table shows distinct difierences from that of the Ipswich 

 flora (Table i., p. 66), and when, as in column 4, the species of 

 Tce7iiopteris are combined with the Cycads, the percentages agree 

 quite well with the percentages in Jurassic floras, particularly 

 with the Lower Oolite Hora of Yorkshire {see Table ii., p,67). 



The flora of the Walloon Series may now be discussed in more 

 detail. 



Eqiiisetales.—M.em\)ers of this group are not of uncommon 

 occurrence in the Walloon Series. Equisetites rohferuni is 

 almost indistinguishable from the widely spread E. columnaris 

 of Middle Jurassic floras, and Equisetites cf. rajmahalensis is 

 closely comparable with the species in the Liassic flora of India. 

 Schizo7ieurafiij.a is identified with the species described from the 

 Stormberg Beds of South Africa. Pith-casts of Equisetales, 

 however, cannot be regarded as of any value in difi'erentiating 

 between Rhsetic and Jurassic floras. 



