XXXIX] PTEROPHYLLTJM 551 



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

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

 (Anomozamites) Nilssoni (Phill.) 1 . 



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 Muelleri 2 . 



A B 



FIG. 611. A, Pterophyllum Nilssoni; B, Nilssonia mediana. (After 

 Thomas and Bancroft.) 



Pterophyllum Fayoli Renault and Zeiller. 



This species 3 was founded on a large frond from the Commentry 

 coalfield with a stout rachis bearing linear 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 united 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 4 from 

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

 A fairly stout rachis bears incomplete pinnae the longest of which 

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

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



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



2 Ettingshausen (86) PL vin. figs. 1921. 



3 Renault and Zeiller (88) A. p, 619, PL LXVIII. 4 Arber, E. A. N. (12 2 ). 



