230 



KILSSONIA. 



3. Nilssonia tenuinervis, Nathorst. 



[Berattelse, p. 35, 1880.] 



(Text-fig. 41.) 



1880. Nilssonia tenuinervis, Nathorst, Beriittelse, p. 35. 

 1894. ? Nilssonia polymorpha, Bartholin, Bot. Tidsskrift, pi. i. figs. 5, 6. 

 1900. Nilssonia tenuinervis, Seward, Manchester Lit. & Phil. Soc. vol. xli\v 

 p. 4. 



Frond linear ; the lamina entire, characterized by the numerous 

 fine veins given off almost at right angles from the axis. 



Nathorst proposed the specific name tenuinervis for a few examples 

 of Nilssonia fronds from the Inferior Oolite of the Yorkshire 



FIG. 41. Nilssonia tenuinervis, Nathorst. No. 13,502. (Nat. size.) 



coast, which differ from the other species of the genus in the 

 greater number and fineness of the lateral veins ; he notices 

 the resemblance which the species bears to the genus Tceniopteris. 

 Nathorst' s species maybe compared with Nilssonia orientalis, Heer. 1 

 Nathorst's species appears to be represented by three specimens 

 in the National Collection and by a few others in the Museums of 

 Manchester and other places. 



1 Heer (78 2 ), pi. iv. figs. 4-9 ; Nathorst (97), pi. i. fig. 18. 



