No. 675. 



Vol. LVII of Whole Series. 



Price 2s. 6d. 



The 



a^azme 



nDontbl\> 3ournal of ^eoloov 



WITH WHICH IS INCOKPOKATED 



THE GEOLOGIST. 



.mxKBBY / SEP 28 1920 



HENEY WOODWARD, LL.D., F.R.s' 



AND 



R. H. RASTALL, M.A. 



iSSIBTED Br 



I Pkof. J. W. GREGORY. D.Sc, F.R.S. Sir JETHRO J. H. TEALL, Sc.D., P.R.S. 



~F. H. HATCH, Ph.D., M.Inst.M.M. Prof. W. W. WATTS, Sc.D., P.R.S. 



Prof. J. E. MARR, Sc.D., F.R.S. HENRY WOODS, M.A., P.R.S. 



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



SEPTEMBER, 1920. 



Ko y 



CONTENTS :- 



Editorial Notes. 



Page 



.. 385 



The Nicol Memorial. (Plate VI.) 387 



Original Articles. 



Morphological Studies on the 

 EchinoideaHolectypoicIa. X. By 

 H. L. Hawkins. (Plate VII.)... 393 



The Origin of Flint. By E. M. 

 Beydone 401 



The Distribution of British Car- 

 boniferous Nautiloids. By the 

 late Dr. Wheelton Hind 405 



Investigation of the Mechanical 

 Constitution of Loose Arenaceous 

 Sediments by the method of 

 Elutriation. By H. A. Baker. 

 (With 5 Text-figs.) [Contimied.) 411 



Page 



IlEVIEWS. 

 William Smith : His Maps and 



Memoirs 421 



British Quaternary Deposits 423 



Geology of Lichfield 428 



Mesozoic Igneous Eocks in Japan... 425 



The Nomenclature of Petrology ... 426 



Origin of HEematite and Eutile 427 



Economic Geology of Central 



Scotland, Area VII 427 



Geology of the Mid-Continental 



Oilfields 428 



Correspondence. 



Professor J. E. Marr 429 



E. M. Brydone 429 



Professor W. M. Davis 429 



Professor T. G. Bonney 431 



Eev. E.Hill '. 432 



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