No. 632. 



Decade VI.— Vol. IV.— No. II. 



Price 2s. net. 



THE 



GEOLOGICAL MAGAZINE 



OB 



jpontltlj) Journal of deoloijt) 



WITH WHICH IS INCOKPO HATED 



TIHIEI G-EOH.OG-IST. 



EDITED BY 



HENRY WOODWARD. LL.D.. F.R.S.. F.G.S 



ASSISTED BY 



Professor J. W. GREGORY, D.Sc, F.R.S., F.G.S. 

 Dr. GEORGE J. HINDE. F R.S., F.G.S. 

 Sir THOMAS H. HOLLAND, K.C.I E., A.R.C.S., D.Sc, F.R.S., Vice-Pres. G.S. 

 Dr. JOHN EDWARD MARR, M.A., Sc.D. (Camb.), F.R.S., F.G.S. . 

 SIR JETHRO J. H. TEALL, M.A., Sc.D. (Camb.), LL.D., F.R.S., F.G.S. 

 Professor W. W. WATTS, Sc.D., M.Sc, F.R.S., F.G.S. 

 Dr. ARTHUR SMITH WOODWARD, F.R.S., F.L.S., Vice-Pres. Geoi.. Soc. 



FEBRUARY. 1917. 



CONTENTS. 



1. Original Articles. Page 



New Chalk Polyzoa. By B. M. 

 Brydone, F.G.S. (Plate III.)... 49 



Age of the Maitai Series^ New 

 Zealand . By C . T . Trechmann , 

 M.Sc., F.G.S. x (Pis. IV and V.) 53 



Rhythmic Deposition of Flint. By 

 Prof. Grknville A. J. Cole, 

 M.B.I.A., F.G.S., Royal College 

 of Science, Dublin 64 



Geology at the Seat of. War. By 

 Aubrey Strahan, Sc.D., LL.D., 

 F.R.S., V.P.G.S 



The Jaw of Plectrodus, a Silurian 

 Fish. By Arthur Smith Wood- 

 ward, LL.D., F.R.S., F.G.S.... 



Geology of Cil-y-Coed District 

 (Carnarvonshire). By E.Wynne 

 Hughes, M.Sc, F.G.S. (Con- 

 cluded.) 



Reviews (continued). Page 



Professor C. Schuchert's Text-Book 

 of Geology, Part II 84 



Dr. 0. C. Farrington : Meteorites, 

 their Structure and Composition 86 



Radioactivity and Mountain Build- 

 ing. By H. Jeffreys 



Mineral Resources of the United 

 States for 1914 



87 



68 



74 



II. Reviews. 

 Geography and Geology of Sinai. 

 By Dr. John Ball. F.G.S., 

 M.Inst.C.E 



75 



80 



88 



III. Reports and Proceedings. 



Geological Society of London — 



December 20, 1916 '. 89 



January 10, 1917 91 



Edinburgh Geological Society 93 



Geological Soeie y of Glasgow 93 



IV. Correspondence. 



J. W. Gregory T 95 



V. Obituary. 



Ernest Swain 95 



Reginald Cooksey Burton 96 



Sir E. B. Tylor, F.R.S 96 



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