CH. XXXIX] 



PTILOPHYLLUM 



527 



the stomata, which appear to be like those of P. pecten, are 

 scattered and not in rows. 



Ptilophyllum antarcticum (Halle). 



The fronds from the Jurassic rocks of Graham Land, described 

 by Halle as Zamites antarcticus 1 , are very similar to some forms 

 of P. pecten and to P. boreale and other Greenland forms; the 

 linear subacute pinnae are attached to the upper face of the rachis 

 at a wide angle and the base of the lamina is truncate and may 

 be very slightly constricted. The veins are dense, as many as 

 5 in 1 mm., and they are occasionally forked near the base (fig. 

 598, A). 



FIG. 598. A, A', Ptilophyllum antarcticum. B, P. Anderssoni. (After Halle.) 



Ptilophyllum Anderssoni (Halle). 



This Graham Land species (fig. 598, B), referred by Halle to 

 Zamites 2 , is of the same general type as P. pecten, but is charac- 

 terised by a coarser venation and by the wider angle of attachment 

 of the pinnae. 



Ptilophyllum Dunkerianum (Goeppert). 



Goeppert 3 proposed the name Pterophyllum Dunkerianum for 

 some specimens from the Wealden of North Germany which were 



1 Halle (13 2 ) p. 58, PI. vn. 

 3 Goeppert (44) p. 52. 



2 Ibid. p. 56, PL vn. 



