No. 539. 



Decade V.— Vol. VI.— No. V. 



Price Is. 6d. net. 



THE 



GEOLOGICAL MAGAZINE 



OR 



^lontliiti Journal of ©eologu. 



WITH WHICH IS INCORPORATKD 



THE GrEOLOG-IST. 



EDITED KY 



HENRY WOODWARD, LL.D., F.R.S., F.G.S., &c. 



ASSISTED BY 



Dr. GEORGR J. HINDK, F.R.S., &c., and HORACE B. WOODWARD, F.R.S., &c. 



MAY, 1909. 



OODSTTEUSTTS 



I. Original Articles. 



Page 



The Trilobite Fauna of Devon and 

 Cornwall. By Dr. Ivor Thomas, 

 B.Sc, F.G.S." (Plate VII.) ...193 



On the Mechanics of Overthrusts. By 

 Dr. M. S. Smoltjchowski, Professor 

 of Physics in Leniberg IJniversity 204 



A Crinoid {Tefracrinu.s [?] felix, 

 sp. nov.) from the Red Crag. By 

 Dr. F. A. Bather, M. A., F.G.S. , 

 etc. (Plate VIII.) 205 



Extinct Marsupials of Western 

 Australia. By Bernard H. Wood- 

 ward, F.G.S., C.M.Z.S., etc. ... 210 



The Constitution of the la^ueous Rocks. 

 By F. P. Mennell, F.G.S. ... 212 



The Microsauria as Ancestors of the 

 Reptilia. By Roy L. Moodie, 

 University of Kansas. (With a 

 page Text-figure.) 216 



Some Unrecorded Erratics in South 

 Pembrokeshire. ByR.H. Chandler 220 



On a Deposit of Allophane. By R. H. 

 Chandler 222 



II. Reviews. 



The Geological Society of Glasgow 

 and its Jubilee ..." 22.3 



Fage 



226 



228 



Gold : its geological and geographical 

 distribution. By J. Malcolm 

 Maclaren, D.Sc, F.G.S., etc. ... 



Brief Notices : Vertebrates in Asphalt 

 — Burning Cliffs — • Fossil Tsetse 

 Fly — Devonian Fishes — ' Eenie ' 

 Coal — Royal School of Mines — Red 

 Granite in Transvaal ' 



III. Reports and Proceedings. 



Geological Society of London — • 



February 24, 1909 230 



March 10 233 



March-24 23.5 



Palpeontographical Society, March 19 236 



Mineralogical Society, March 23 ... 237 



IV. Correspondence. 



Mr. R. M. Deelev, F.G.S. 

 Rev. 0. Fisher .." 



V. Obitu.^ 

 F. G. H. Price, F.S 



VI. Misc/ell 

 W. H. Hudleston, 



LONDON : DULAU & CO., 37, SOHO 



^" The Volume for 1908 of the GEOLOGICAL MAGAZINE is ready, 

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