284 Brief Notices. 



(3) Les Bryozoaires fossiles des terrains du sud-est de la France. 

 IX. Aqottanien. By F. Canc Ball. Soc. Geol. France, ser. 4, 

 vol. xv, pp. 320-334, pis. iii, iv. 1916. 



(1) In the first of these papers, M. Canu gives a list of works 

 dealing with Polyzoa from the years 1555-1792 inclusive, thus 

 rendering available for students primitive works that otherwise may 

 escape their notice. 



(2) The second is a bibliography of the Eocene Polyzoa of the Paris 

 basin, with lists of the species mentioned; for the sake of com- 

 pleteness, works dealing with Belgian and British Eocene forms 

 also are included. 



(3) In the third, M. Canu produces his ninth contribution to the 

 Tertiary Polyzoa of S.W. France, namely those of Aquitanian age. 

 Nine new species, illustrated in the plates by photographs of the 

 originals, and one new genus are described. 



2. The Physical Conditions indicated by the Flora of the 

 Calvert Formation. By E. W. Berry. U.S.A. Geological Survey, 

 Prof. Paper 98-F, pp. 61-70, pis. xi-xii. 1916. 

 TPHE Calvert formation consists of diatomaceous earth, sandy clays, 

 _1. and marls, typically developed in Maryland. Owing to the 

 quantities of diatoms present, there appears to have been assumptions 

 in some quarters that a cold climate was indicated for the region at 

 the time of their deposition. The most abundant plant remains are 

 these diatoms, which have been much studied by experts, who have 

 identified a large number of species indicating a habitat of relatively 

 warm or sub-tropical temperature. The land plant species number 

 twenty-six, of which twenty-three are Dicotyledons. Dr. Berry gives 

 tables comparing these species both with the most similar fossil forms 

 and the nearest living species, and concludes that they indicate 

 "warm-temperate affinities comparable with the existing coastal 

 floras of South Carolina and Georgia". The age of the flora is Middle 

 Miocene or Tortonian. 



3. The Geological Factors affecting the Strategy of the War 

 and the Geology of the Potash Salts. By Professor J. W. 

 Gregory. Trans. Geol. Soc. Glas., xvi, pp. 1-33, 1916. 

 rpHE importance of coalfields in war strategy has been severely 

 I demonstrated by the occupation by Germany of the French, 

 Belgian, and Polish fields, and to this topic Professor Gregory gives 

 first place. He points out that " when the Peace Congress assembles, 

 its meeting room might be appropriately provided with a geological 

 map of Europe and Western Asia, since the resettlement of the 

 frontiers will be largely dependent on geological influences, of which 

 the diplomatists may have no conscious knowledge". The distri- 

 bution of oilfields and of copper and iron ores is also discussed in 

 relation to the War, but the most valuable part of the paper from 

 the point of view of geologists is that which deals with the great 

 German potash deposits. Their origin is dealt with and illustrated 

 by many useful sketch-maps and sections, and much information 



