NILSSONIA. 



55 



V. 2171.** Figs. So, and b. The two figured specimens are 

 examples of the narrower form of the species : in a the almost 

 entire lamina resembles a small example of T&nioptens ; in b 

 the truncate segments are well shown ; and in both cases the 

 venation is distinct. Both specimens are represented twice the 

 natural size. Rufford Coll. 



V. 2171tf. Fig. 3c. Broader specimen, Tl cm. in breadth.. The 

 median groove on the upper surface and the veins are very 

 distinct. This example serves as a connecting link between the 

 larger forms of the plant as described by Schenk, and the smaller 

 English specimens. 



a. 



c. 



\ (Twice nat. size.) 



NiJssonia Schatimburgensis (Dunk.). 

 FIG. 3 and b (V. 2171**). 

 FIG. 3c (V. 21710). 



V. 2171. Several specimens. The variation in the size and 

 division of the lamina is well illustrated in these examples. 

 Generally speaking, Schenk's figures represent leaves with more 

 regular lobes than are found in the English specimens. In some 

 cases the segments are numerous and very narrow, in others the 

 lamina is almost entire. 



V. 2171i. A specimen with the lamina entire for a length of 

 4-2 cm. 



V. 2171c. This specimen of one of the narrower forms of the 

 species shows a depression at the distal end of the lamina, and 

 presents a very similar appearance to that of Tceniopteris Beynchii 

 (Schenk) as figured by Schenk. Ecclesbourne. Rufford Coll. 



