XXXIX] 



PTEEOPHYLLTJM 



551 



species is, however, probably a Nilssonia. The stoma represented 

 in fig. 611, A, is from the lower epidermis of Pterophyllum 

 (Anomozamites) Nilssoni (Phill.)^ 



Pterophyllum extends from Upper Carboniferous to Lower 

 Cretaceous strata and is especially characteristic of Keuper and 

 Rhaetic floras. A possible representative of the sub-genus 

 Anomozamites is described by Ettingshausen from Tertiary beds 

 in New South "Wales as Anomozamites Mmlleri^. 



AT' 



A ^ B 



Fig. 611. A, Pierophyllum Nilssoni; B, Nilssonia mediana. 

 Thomas and Bancroft.) 



(After 



Pterophyllum Fayoli Renault and Zeiller. 



This species^ was founded on a large frond from the Commentry 

 coalfield with a stout rachis bearing Unear pinnae, attached along 

 a narrow groove on its outer edge, reaching a length of 12 cm. 

 and a breadth of 1 cm. ; adjacent pinnae are imited at the base. 

 The apices are pointed and there are 10-12 unbranched veins in 

 the lamina. Fig. 612 shows a small piece of the large specimen 

 in the Natural History Museum, Paris. 



Pterophyllum sp. Arber. 



The only representative of a Carboniferous frond of Cycadean 

 habit discovered in Britain is that recorded by Arber* from 

 WestphaUan strata at a depth of 1834 ft at Barfreston in Kent. 

 A fairly stout rachis bears incomplete pinnae the longest of which 

 is shghtly more than 1 cm. in length and 1 — 1-5 cm. broad; each 

 segment, very slightly contracted at the base, has 3 — 4 occasionally 



^ Thomas and Bancroft (13) PI. xix. fig. 5. 



8 Ettingshausen (86) PI. vni. figs. 19—21. 



3 Renault and ZeiUer (88) A. p. 619, PI. Lxviii. 



1 Arber, E. A. N. (12"). 



