261 



-Androstrolus, but where there is so good a reason, as in this 

 instance, for believing the flowers to belong to a definite plant, it 

 is hardly necessary or advisable to introduce a separate designation. 

 The imperfect specimen from Franz Josef Land figured by 

 Nathorst 1 as a male flower of Ginkgo, is hardly distinct enough 

 for determination. 



39,320. Text-fig. 45. 



Numerous isolated pollen - sacs, about 5 mm. long, showing 

 a median line indicating the longitudinal dehiscence. Fragments 

 of the slender axis of the male flower are associated with the loose 

 pollen-sacs. 



This specimen is labelled by Bean " unknown leaves " (so 

 called by Phillips in the description of his fig. 23, pi. vii. 2 ) ; and 

 by Nathorst, " male flowers of Gin/ego digitata." 



2. Ginkgo whitbiensis, Nathorst. 



[Ot'vers. k. Vefaft. Akad. Fbrhand. p. 74, 1880.] 



(PI. IX. Fig. 8.) 



1880. Ginlijo whitbiensis, Nathorst, Beratt. p. 74. 



1892. Ginkiju wliitbicnxis, Fox-Strangways, Tab. Foss. p. 138. 



Type-specimen. British Museum (No. 39,331). 



Leaves smaller than in Gin/ego digitata ; lamina deltoid in shape, 

 deeply dissected into linear segments with acuminate or somewhat 

 truncated tips. 



The small form of leaf for which Nathorst suggested the name 

 Ginkgo ichitbiemis may be conveniently regarded as distinct from 

 G. digitata, from which it differs in the smaller size of the lamina 

 .and in the somewhat more pointed segments. Some of the small 

 Ginkgo leaves, recently described by Nathorst and by Newton & 

 Teall, from Frauz Josef Land, 3 may be compared with this type. 



39,331. PL IX. Fig. 8. 



A leaf considerably smaller than the typical G. digitata, with 

 tapered segments traversed by prominent forked veins. A second 



1 Nathorst (00), pi. i. fig. 49. 



2 Phillips (75). 



3 Nathorst (00) ; Newton & Teall (97). 



