No. 664. 



Decade VI.— Vol. VI.— No. X. 



Price 2s. 



The 



Geological Magazine 



fH>ontbl\> 3ournal of (Beolcnjy. 



WITH WHICH IS INCCIKI'IIKAIUJI 



THE GEOLOGIST; 1 ;^ ' 1 



MOTE]) BY 



T 3 1 919 





HENRY AVOODWA1!]). LR.1)..\ L.R.S. 



o\ 



B. H. R A STALL, M.A. 



JSS18TJ51) BY 



Prof. J. W. GREGORY. D.SC F.R.S. Sir JETHR0 J. H. TEALL, Sc.D., F.R.S. 



F. H. HATCH, Ph.D., MJnsi.M.M. Prof. W. W. WATTS, Sc.D., F.R.S. 



P«of, J. F. MARK, Sc.D., F.R.S. HENRY WOODS, M.A., F.R.S. 



Dr. A. SMITH WOODWARD, F.R.S. 



OCTOBER, 1919. 



CONTENTS:— 



Page 



Editorial Notes 433 



Original Articles. 

 A Remarkable Carboniferous Coral. 



By R; G. Carruthers. (With 



Plate XI and Text-figures.) 436 



Morphological Studies on the 



Echinoidea Holectypoida and 



their Allies. By H.L.HAWKINS. 



(With a Figure.') 442 



The Magnesian Limestone of 



Durham. Part I. By D. 



Woolaoott 452 



Articles {continued). Page 



The Distribution of " Terebclla' n 

 cancellata. By F. A. Bather . 466 



Iceland — a Stepping -Stone. By 

 E. B. Bailey. (With a Figure. ) 466 



Some American Papers on Volcanoes 477 



Correspondence. 



D. Woolacott 479 



11. M. Brydone 480 



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