XXVIl] 



WEICHSELIA 



495 



Frond bipinnate, rachis broad ; pinnae very long, of uniform breadth 

 and with prominent axes ; pinnules crowded, entire, with obtuse apex, 

 usually oblong but more or less triangular or rounded towards the distal 



B 





i\l 



l^.^\ 



^AX 



Fig. 333. Weichselia Mantelli. 



A. Part of a frond from the Wealden of Sussex, England. (British 



Museum ; v. 2630. f nat. size.) 



B. Pinnule from Bernissart, Belgium ( x 3). 



C. Weichselia erratica, 'S&th. Section of pinna. (After Nathorst.) 



ends of the pinnae. The pinnules, which may reach a length of 9 cm., are 

 characterised by a fleshy lamina attached by the whole breadth of the 

 base ; the two rows of segments on each secondary rachis are usually 



