NO. 3.] DESCRIPTION OF SPECIES. 19 



Pityospermum sp. 

 PI. II. figs. 17, 18 and (magnified) 18a. 



This specimen differs by the considerable size of the seed and the greater 

 length of the wing, which also appears to be narrower. It is, however, so 

 obliterated in the specimen, fig. 18, that its real form cannot be ascertained 

 with any certainty. 



Whether the specimen, fig. 19, is really a winged seed is uncertain, the 

 part that should correspond to the wing seems too thick for that. It ought 

 therefore at present to be considered as incertae sedis. 



Newton and Teall have also figured two winged seeds (1. c. PI. 

 38, figs. 7, 8) which evidently belong to one or two other species character- 

 ised by very large seeds. Their specimen fig. 8 is about 28 mm. in length. 



It therefore appears as if there had been five or six species of Pinites 

 growing in the same locahty, which is not however per se improbable. From 

 the Tertiary Taxodium slate at Cape Staratschin of Spitsbergen, Heer has 

 described no less than 11 different species founded on seeds and scales, so 

 that the occurrence is not without analogy among cases previously known. 

 It is moreover possible that a part of these winged seeds may have been car- 

 ried hither from a considerable distance. 



Pityophyllum cf. Staratschini Heer sp. 

 PI. II. figs. 24, 25. 



Pinus Staratschini Heer 'Kreideflora der arktischen Zone', p. 129, pi. 38, 

 fig. 6, 7. (Kgl. Svenska Vetenskaps Akademiens Handlingar 

 vol. 12, no. 6 and Flora fossihs arctica, vol. 3). 

 Pityophyllum Staratschini Nathorst 'Zur mesozoischen Flora Spitzbergens', 

 pp. 41, 68, pis. 5, 6, figs. 28-30, 32-36. 

 These leaves are narrower than those of Taxites gramineus Heer, while, 

 at the same time, they are broader than the leaves of Pityophyllum Lind- 

 stromi. The surface presents the same transverse rugosities as in the former 

 species, which is also the case with very similar leaves described by me 

 from the Upper Jurassic beds at Advent Bay, Spitsbergen. The insufficiency 

 of the material, however, renders the determination far from certam. 



