No. 640. 



Decade VI.— Vol. IV.— No. X. 



Price 2s. net. 



THE 



GEOLOGICAL MAGAZINE 



4Honthlij Journal of deologi). 



WITH WHICH IS INCORPORATED 



THIS G-EJOILOG-IST- 



EDITED BY 



HENRY WOODWARD. L.L.D.. 



F.R.S., F.G.S.. &.c. 



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. 

 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. (Camb.), M.Sc, F.R.S., F.G".S. 

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



I. Original Articles. Page 



Studies on the Echinoidea. VI. 

 Conulus albogalerus. By Her- 

 bert L. Hawkins, M.Sc, F.G.S. 

 (Plate XXVIII.) 433 



Observations on Polymorphites. 

 By A. E. Trueman, M.Sc. 

 (With thirteen Text-figures.) ... 442 



The Pahang Volcanic Series. By 

 E. S. Willbourn, B.A., Feder- 

 ated Malay States. (PI. XXIX.) 447 



A System of Petrography. By 

 Professor S. J. Shand, D.Sc, 

 F.G.S 463 



II. Beviews. 



A Gigantic Eocene Bird 469 



New Cretaceous Gastropoda 471 



The Silurian Inlier of Usk 472 



O O IDTTIE 



lviews {continued). Page 



Evidence for A"tlan4is-.~v~- rrrrT^ 473 



-'I he Earthquake of Marsica 474 



Line of Depression in Portugal 475 



Central Coalfield, Scotland 475 



Molybdenum in Natal 475 



Calcite in Silicified Wood 476 



TheBoyal Society Club 476 



Brief Notices : Tertiary Fauna, 

 Georgia — Tertiary Mollusca, 

 Florida — Mollusca from Holder- 



ness — New American Meteorites 477 



III. Obituary. 



Alfred N. Leeds, F.G.S 478 



IV. Miscellaneous. 



Dove Holes Cave, Buxton 480 



The Piltdown Gravels 480 



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