LACCOPTERIS. 83 



crowded, broad linear segments with the venation characters 

 clearly preserved. The lowest segment has a length of 8 mm., 

 and the longest is 2 cm. long. Most of the examples of this 

 species have longer, narrower, and less crowded segments than 

 the two specimens represented in PI. XII. This specimen is 

 labelled by Bean Phlelopteris frondosa. 



Upper Shale, Scarborough. Bean Coll. 



39,225. PI. XIII. Fig. 2. 



Labelled by Bean Phlelopteris contigua and P. polypodioides. 

 This specimen shows portions of large pinnae with long linear 

 segments preserved in ironstone and showing well-defined venation 

 .(Fig. 2). 



Upper Shale, Scarborough. Bean Coll. 



FIG. 10. Laccopteris polypodioides. A single sorus. [No. V. 2522.] 



V. 2522. Text-figs. 10 and 11s. 



Part of a fertile pinna in the form of a brown impression, as in 

 39,252, but the pinnules are fertile, also longer and farther apart. 

 The sori are circular and arranged on either side of the midrib ; 

 each sorus consists of about twelve sporangia with a well-marked 

 oblique annulus. In most of the sori the sporangia have fallen 

 off, leaving a gap in the lamina. Such sporangia as have been 

 preserved are thoroughly carbonized, but the prominent walls of 

 the annulus cells stand out distinctly as black ridges. The drawing 

 in Text-fig. 11s shows the venation clearly and the disposition 

 of the circular sori ; the fragment from Stamford, shown in 



