1 20 WEICHSELIA. 



the frond is stiff and rigid; the axes of the pinnae are, like the 

 main rachis, prominent and broad. Pinnules strong and rigid, 

 inclined to the surface of the slab and to the axes of the pinnae. 

 Venation clearly shown in some of the pinnules, e.g. those enlarged 

 in the woodcut, Fig. 12. Towards the distal ends of the pinnae, 

 the pinnules become shorter and approach a more triangular or 

 deltoid form, which is, however, more clearly seen in other 

 specimens. Compare the figures of fronds by Stiehler, Trautschold, 

 Hosius and von der Marck, etc. 



A somewhat similar habit is seen in Saporta's figure of Sclero- 

 pteria Pomelii, 1 but the two species are probably in no sense 

 related. Sussex. Heckles Coll. 



FIG. 12 (V. 2630). Pinnules of Weichselia MantelU (Brong-.). Enlarged 4 times. 



V. 26300. Part of a frond showing a wide rachis with pinnse. 

 Sussex. eckles Coll. 



V. 2173. Fig. 13. Portions of young pinnse, or terminal pieces 

 of older pinnae showing smaller pinnules about 2-5 mm. in length, 

 and of a different shape to the full-sized segments. Cf. Stiehler, 

 Palaeontographica vol. v. pi. xiii. figs. 205; also a fragment 

 figured by Nathorst in his "Beitrage zur mesozoischen Flora 



FIG. 13 (V. 2173). Pinnules of Weichselia MantelU (Brong.). Twice nat. size. 



Japans," pi. iv. fig. 3, which he describes as possibly part of a 

 fertile pinna of Pecopteris Geyleriana ( = Cladophlebis Dunkeri}, 

 but he recognizes at the same time a resemblance to Weichseh'a. 



1 Pal. Fran?, vol. iv. p. 423, pi. 285, fig. 7, and pi. 286, fig. 2 and figs. 6-7. 



