XXXIX] PTEROPHYLLTJM 555 



1 met. long and at least 15 cm. broad. The segments, 3 7 cm. 

 long and 8 18 mm. broad, are often set at right- angles to the 

 rachis ; the edges are parallel but the lower edge bends upwards 

 at the apex. The veins are simple or forked and approximately 

 0-3 mm. apart. 



PteropJiyllum Bavieri Zeiller. 



This Rhaetic species from Tonkin 1 and Persia 2 is interesting 

 as affording an example of a frond with exceptionally narrow 

 and contiguous pinnae. The frond is narrow and lanceolate, 

 15 20 cm. long with pinnae normal to the rachis, -5 1 mm. 

 broad and 7 25 mm. long attached by the whole base which is 

 sometimes slightly enlarged. The veins are simple or forked, 

 15 '25mm. apart: the apices of the segments are rounded or 

 truncate and the form of the whole is similar to that of Ptero- 

 pJiyllum aequale but narrower. 



PteropJiyllum (Anomozamites) inconstans Braun. 



In habit this Rhaetic species 3 resembles Nilssonia compta. 

 The linear-lanceolate fronds, as described by Zeiller 4 in his Tonkin 

 memoir, attain a length of 20 cm. and a breadth of 4 cm. The 

 rachis, characterised by numerous transverse ridges, bears alternate 

 or subopposite leaflets often at right- angles ; they are almost 

 rectangular and hardly longer than broad, attached by the whole 

 of the base, which may be broadened, to the upper face of the 

 rachis, but the lamina does not cover the whole of the rachis as 

 in Nilssonia. The pinnae vary in breadth on the same frond and 

 occasionally the lamina is continuous as in some forms of Nilssonia. 

 Schenk 5 figures examples from the Rhaetic of Franconia in which 

 the lamina is very irregularly dissected and may be entire for a 

 considerable distance. The epidermal cells have slightly sinuous 

 walls. A similar type is represented by PteropJiyllum (Anomo- 

 zamites) Schenki Zeill. 6 , but the segments are contracted basally 

 and become wider towards the apex where, as in P. inconstans, 

 the edges are parallel. Feistmantel's species Platypterygium 



1 Zeiller (03) B. p. 198, PL XLIX. figs. 13. 2 Ibid. (05) p. 194. 



3 Braun, F. (43). 



4 Zeiller (03) B. p. 177, PL XLIII. fig. 8; PL XLIV. figs. 1-5. 



5 Schenk (67) A. PL xxxvin. figs. 59. 



6 Zeiller (03) B. PL XLIII. fig. 7. 



