Geology and Mineralogy. 439 



geological horizon. They are arranged in systematic order, be- 

 ginning with the lowest in organization. The classification is in 

 line with modern discovery, the Gymnosperms standing at the 

 base of the phanerogamous series, the Monocotyledons being 

 classed as Angiosperms coordinate with the Dicotyledons, and 

 these latter being divided into Archichlamydse (equal to the 

 Apetalse and Polypetalse of most authors) and Sympetalae 

 (=Gamopetalse), culminating in the Composite. In short it is 

 substantially the classification of Engler and Prantl. The genera 

 are also described and the species numbered for each genus. In 

 addition to this there is a running number to all the species irre- 

 spective of genera. The systematic part is preceded by a his- 

 torical sketch occupying thirty pages and giving an able review 

 of the progress of paleophytology in Italy from the earliest times, 

 and a complete bibliography covering 425 titles. These and 

 other features will make this work a constant handbook for all 

 who are engaged in the study of fossil plants. It is written wholly 

 in Latin and is without illustrations, but the typography and 

 general appearance are in all respects pi'aiseworthy. l. p. w. 



5. The Correlation of Early Cretaceous Floras in Canada 

 and the United States ; by Sir J. W. Dawson. Trans. Roy. Soc. 

 Canada, vol. x, Section iv, pp. 79-93. — The history of our knowl- 

 edge of the lower Cretaceous deposits in western North America 

 since they were first made known by Richardson in 1872, is suc- 

 cinctly given in this paper as introductory to the description of 

 certain plant remains collected by Mr. H. M. Ami and by Dr. 

 Hayden in Canmore, Alberta, in the Kootanie district. The 

 material was very fragmentary and the determinations are for 

 the most part doubtful, much more so than those treated in 1885, 

 but taken in connection with these and with the forms now known 

 from the Great Falls of the Missouri, in Montana, referred by 

 Newberry to the Kootanie, they help to indicate the probable 

 nature of the vegetation of that epoch. Twenty-one distinct 

 forms are recognized, thirteen of which are given specific names, 

 and of these seven are referred to species occurring in the Poto- 

 mac formation of Virginia. A summary of the plants of the 

 Kootanie group is given at the end indicating those found else- 

 where. The absence of Dicotyledons (" Angiosperms ") thus far 

 is taken as negative evidence that the Kootanie may be older than 

 the Potomac, and the conclusion from the plant remains is ex- 

 pressed that there can " be scarcely any doubt as to their general 

 reference to the Neocomian Group of the Lower Cretaceous, and 

 to the lower part of the earlier or Lower Cretaceous as held by 

 the Canadian Geological Survey." The figures in the text are 

 very poor, and the proof reading was carelessly done, e. g. 

 "Pagophyllum" for Pagiophyllum. L. f. w. 



6. A New Tainiopterid Fern and its Allies ; by David White. 

 Bulletin Geol. Soc. of America, vol. iv, pp. 119-132, pi. i. — The 

 discovery of a new species of Carboniferous fern is not usually a 

 very important event, but in this case its relationships, as shown 



