144 CLADOPHLEBIS. 



39,245. This specimen, an imperfectly preserved portion of 

 a fertile frond, is of interest from the point of view of the 

 comparison of sterile and fertile pinnae. The pinnae and pinnules 

 are exactly like those represented in PL XX. Fig. 3a, but in 

 39,245 we have a portion of the rachis as well as pieces of three 

 or four pinnae attached to it. Labelled by Bean Phlebopteris 

 undans. The specimen shows clearly that the leaf bearing the 

 fertile pinnae had the same habit as the sterile fronds. 



Upper Shale, Scarborough. 



V. 3650, V. 3651. The latter specimen is labelled by Bean 

 Pecopteris scarburgensis, a name which does not appear to have- 

 been published. Similar to 39,236 (PL XIV. Fig. 1). 



Tipper Shale, Scarborough. 



V. 3940. A small piece of a pinna with long pinnules of the- 

 ' imignis ' type ; labelled Cycadites gramineus. 

 Lower Shale and Sandstone, Scarborough. 



39,238. A fairly large specimen, with a rachis 17 cm. in, 

 length. The habit of the frond is distinctly open, especially 

 towards the apical portion, where the pinnae are farther apart and 

 the pinnules shorter and relatively broader. In the Leckenby 

 Collection there is a still finer example, illustrating the open habit 

 at the apex of a frond ; we have precisely the same appearance 

 presented by a specimen of Asplenites Roesserti figured by Schenk. 1 

 The pinnules are slightly dentate. Labelled by Bean Pecopteris 

 denticulate*, and P. ligata. 



Scarborough. Bean Coll. 



39,248. PL XV. Fig. 4. 



The apical portion only is shown in the drawing. It is difficult 

 to feel certain as to the affinity of this specimen ; it appears to be 

 identical with a similar apex of a frond figured by Heer from the 

 Jurassic rocks of Siberia as Aspleniwn petruschmense, 2 and may be 

 compared also with Asplenium whitliense tenue 3 of the same 

 author. 



1 Schenk (67), pi. x. 



2 Heer (78), ii. pi. i. 



3 Heer (77 2 ), ii. pi. iii. fig. 5. 



