574 



CYCADOPHYTAN FRONDS 



[CH. 



closely allied to the European leaves. The apparent lateral 

 attachment of the lamina in the drawings published by Oldham 

 and Morris and Feistmantel is due to imperfect preservation ; the 

 lamina ends in two raised ridges, and the discovery of a specimen 

 in which the lamina completely covers the rachis confirmed the 

 impression made by the other specimens. The Amurland Jurassic 

 species Nilssonia Schmidtii 1 Heer though probably not identical 



FIG. 622. Nilssonia compta. (Whitby Museum; nat. size.) 



with N. compta is a very similar type ; it was originally described 

 by Heer as Anomozamites Schmidtii and transferred by Nathorst 2 

 to Nilssonia: the veins are occasionally forked near the rachis 

 and are rather farther apart (-5 mm.) than in N. compta and the 

 segments are broader and deeper than in the English species. 

 Nilssonia nipponensis Yok. 3 a Jurassic species recorded from 

 Japan and North America is another similar type. 



1 Heer (78) ii. Pis. xxm., xxiv. ; Seward (12 3 ) p. 27, PI. n. 



2 Nathorst (97) p. 13. 



3 Yokoyama (89) B. Pis. v., vn., xn., xm. ; Ward (05) B. PI xvu. 



