

XLVIIl] PITYOSPERMUM 397 



Abietineous seeds is a valid reason for suggesting the inclusion 

 of the Rhaetic specimens in the Abietineae, though it would be 

 going too far to conclude that the seeds were borne on cones 

 generically identical with or even closely related to those of any 

 existing representative of the family. A Pliocene seed figured by 

 Engelhardt and Kinkelin 1 as Pinus Timleri (fig. 786, B) bears a 

 close resemblance in the form of the wing to some of the Rhaetic 

 specimens. 



Pityospermum Nilssoni Nathorst. 



This species, also from the Rhaetic flora of Scania 2 , is character- 

 ised by the much longer wing (2-7 cm.) which in size and form 

 differs much more widely than Pityospermum Lundgreni, P. Nan- 

 seni, and other Jurassic types from the wings of any recent seeds. 



Pityospermum Nanseni Nathorst. 



The seed shown in fig. 789, A, 11 mm. long, is drawn from a 

 specimen in the Museum of the Geological 

 Survey (Jermyn Street) collected by Dr 

 Koettlitz in Franz Josef Land and of 

 Upper Jurassic or Wealden age: this and 

 other seeds are figured by Newton and 

 Teall 3 . The name Pityospermum Nanseni 

 was applied by Nathorst 4 to similar speci- A 



mens obtained by Dr Nansen from the same Fl f; 789 ' A> 



~, , . j j . -c, Nansem. B, Pityosper- 



region. Other winged seeds from Franz mum sp> (A , drawn from 



Josef Land closely resemble Heer's species a specimen in the Museum 



Pinus Maakiana 5 from Jurassic rocks in of the Geological Survey 

 . figured by Newton and 



Siberia. A seed, 1*2 cm. long, from Weal- Teall; B, from a speci- 



den beds in the South of England is repro- men, V. 2323, in the 

 duced in fig. 789, B 6 : this is possibly a ***** Mu l seu x m from 



Wealden rocks.) 



distinct species, but the specific determina- 

 tion of separate seeds of this form is of little value unless the 

 differences are well marked. The important point is the striking 

 resemblance between such seeds as those shown in figs. 788, 789 



1 Engelhardt and Kinkelin (08) PI. xxv. fig. 4. 



2 Nathorst (78) B. p. 32, PL xv. figs. 1719. 



3 Newton and TeaU (97) PL xxxvin. 



4 Nathorst (99) p. 18, PL n. figs. 12, 13. 



5 Heer (77) ii. PL xvi. fig. 1. 6 Seward (95) A, p. 198. 



