CLADOPHLEBIS . 103 



In Saporta's species, Scleropteris dissecta, 1 we have a similar 

 form of frond to that of C. Dunkeri, as regards general outline, 

 but, as Saporta points out in his definition of the genus, the 

 venation is distinct. 



The terminal portions of pinnae which served as Bunker's type 

 for P. Browniana might almost be included in P. Dunkeri, but the 

 more perfect specimens figured by Schenk in his earlier contribution 

 to the Wealden Flora make the retention of the species advisable. 



V. 2377. PL VII. Fig. 3. 



Portions of large pinnae ; pinnules distinct, but venation difficult 

 to determine. Compare this specimen with Schenk's figures 3-5, 

 pi. xxvi., 2 also Nathorst's figures of Pecopteris Geyleriana, etc. 

 Ecclesbourne. Rufford Coll. 



V. 2185. The two specimens with this registered number have 

 entire pinnules gradually passing into small pinnae. They show, 

 in places, the habit of C. J.lbertsu(Dunk.), but cannot be separated 

 by any distinct features from other specimens which agree with the 

 typical form of the species. Ecclesbourne. Rufford Coll. 



V. 2193rt. Same form as the figured specimen V. 2377. Eccles- 

 bourne. Ruford Coll. 



V. 2194. This shows the spreading habit of the frond, and a 

 passage from the bipinnate to the tripinnate form. Details not 

 very distinct. Ecclesbourne. Rufford Coll. 



V. 2219 and V. 2345. Fragments of pinnae ; both of them agree 

 with Schenk's figure, pi. xxvi. fig. I, 3 and here the small pinnules 

 are nearly at right angles to the rachis. Some of the pieces, e.g. 

 in V. 2345, differ from such specimens as V. 2377, in having their 

 ultimate divisions smaller and more at right angles to the axes of 

 the pinnae, but by comparing them with V. 2382, etc., we appear 

 to have a gradual transition to the normal type. There is a 

 difference in the matrix in this case which doubtless has much to 

 do with the apparent divergence in form. Ecclesbourne. 



Rufford Coll. 



1 Pal. Fran^. vol. i. 1873, p. 365, pi. xlviii. fig. 1. 



2 Palaeontographica, vol. xxiii. 



3 Ibid. vol. xix. 



