xxxix] 



NILSSONIA 



577 



fronds are characterised by their large size and by the very broad 

 oblong and distally truncate pinnae with parallel and occasionally 

 branched veins. In the specimens figured by Oldham and Morris 

 and Feistmantel the pinnae are cut off at their bases (fig. 623), 

 which form ridges parallel to the rachis : this feature is not clearly 

 shown in the pubhshed drawings. By breaking some pieces of 



Fia. 62.3. Nilasonia princeps. (Slightly reduced; 

 Indian Geological Survey, Calcutta.) 



rock from a slab containing figured specimens other pieces were 

 found in which the laminae of the bases of segments meet in the 

 middle of the upper face of the rachis. The pinnae vary in 

 breadth from 1 cm. to 3-5 cm. and reach a length of 8 cm. ; the 

 distal end is truncate, the lower edge being strongly curved: 

 the segments are sHghtly broadened at the base. The veins are 

 prominent and parallel, from 0-5 to 0-8 mm. apart. The Eajmahal 

 s. m 37 



