Geology and Mineralogy . 323 



that the land di'ained by the rivers which laid down the plant 

 debris in the Bernissart sediments was to a great extent covered 

 by the two species first named and that the remaining vegetation 

 also consisted principally of ferns. The aspect of the specimens 

 and this abundance of ferns likewise suggests the idea that these 

 plant-bearing sediments were derived from a low region chiefly 

 occupied by ferns to the relative exclusion of larger plants or 

 ti'ees. These probably grew in the higher background or in the 

 localities beyond the reach of the water which deposited the Ber- 

 nissart strata. It is interesting, again, to note that the plant 

 debris contained in these strata furnishes no facts favoring the 

 presence of Angiospermous species. As we know from richer 

 floras of the same age, it appears most probable that the higher 

 classes of Phanerogams were not represented, or at least occupied 

 a very secondary position in the vegetation of the Jurassic and 

 Wealden periods. G. r. w. 



3. Notes on Some Jurassic Plants in the Manchester Museum • 

 by A. C. Seward, M.A., F.R.S., from Volume xliv, Part III of 

 " Memoirs and Proceedings of the Manchester Literary and Philo- 

 sophical Society, Session 1899-1900. — This communication deals 

 with Inferior Oolite species from the Gristhorpe plant beds, in 

 part figured by Lindley and Hutton. It adds certain important 

 data to our knowledge of Jurassic vegetation. . g. r. w. 



4. " The Maidenhair Tree" (Gingko biloba L.); by A. C. 

 Seward, F.R.S., and Miss J. Gowan, Newnham College. Cam- 

 bridge, Annals of Botany, Vol. xiv, No. liii, March 1900 (pp. 

 10U-124, with plates viii-x. — This beautiful tree is here described 

 with a completeness and precision which will be most pleasing 

 and timely to every student of Botany or Palaeobotany. 



Engler's subdivision Gingkoacece is adopted for the monotypic 

 genus Gingko, — distinguished by the possession of motile male 

 cells as well as by other characters of more or less importance. 

 Following an historical sketch and diagnosis, the vegetative 

 structures and fructification are described, reference always being 

 had to the literature on the several subjects. A sketch of fossil 

 Gingkoacece is appended, which adds greatly to the value of the 

 contribution. G. R. w. 



5. New minerals from Greenland. — A recently published 

 account* of minerals collected in 1897 by G. Flink in the Julian - 

 ehaab district of southern Greenland, contains descriptions of a 

 considerable number of new species and also of other rare known 

 species associated with them. This important paper consists of two 

 parts. Part I (pp. 7-180), by G. Flink, is on the minerals of 

 Narsarsuk on the Tunugdliarfik fiord in southern Greenland. 

 These are found only in a very limited area of the prevailing 

 syenite, where the rock has in spots a pegmatitic character. The 

 prominent minerals are microcline and segirite, which often occur 

 as large crystal individuals ; in drusy cavities between these 

 minerals the rarer species occur in successive generations. Of 



♦Meddelelser om Gronland, xxiv, 1899. 



