No. 608. 



Decade VI.— Vol. II.— No. II. 



Price 2s. net. 



THE 



GEOLOGICAL MAGAZINE 



OB 



^Tonthln Journal of (Seologij. 



WITH WHICH IS INCORPORATED 



TIEUE GEOLOGIST. 



EDITED BY 



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



ASSISTED BY 



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

 Db. 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 , F.G.S. 

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

 Db. J. 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., Vice-Pbes. Geoe. Soc. 

 De. ARTHUR SMITH WOODWARD, F.R.S., F.L.S , Pres. Geot... Soc. 



FEBRUARY, 1915. 



OOITTBITTS. 



MAR 25 1915 



I. Original Articles. Page 



Studies in Edrioasteroidea. VI. 

 Pyrgocystis, n.g. By Dr. F. A. 

 Bather, M.A., F.B.S. (Plate 

 III.) (Concluded.) 49 



Badio-activity and the Earth's 

 Thermal History. By Arthur 

 Holmes, A.B.C.S., D.I.C., 



B.Sc, F.G.S. (Parti.) 60 



N Braehiopod Morphology. By Dr. J. 

 Allan Thomson, M.A., F.G.S. 71 



The Laterites of French Guinea. 

 By L. Leigh Fermor, D.Sc. 

 F.G.S. (Continued.) 77 



II. Be views. 



Professor B. S. Tarr's College 

 Physiography 82 



Canada Department of Mines : (1) 

 Fossils of the Anticosti Islands ; 



(2) The Crowsnest Volcanics ; 



(3) A Beatricea-like Organism ... 84 

 Bies & Watson, Engineering 



Geology ... 85 



Limits of Secondary and Tertiary 

 Periods 87 



Eeviews (continued). Page 



Brief Notices : British Museum 

 (Natural History) — Ealing Scien- 

 tific Society — Norfolk and Nor- 

 wich Naturalists' Society — Nor- 

 wich Castle Museum — A Norfolk 

 Geologist — Bugby School — 

 Liverpool Geological Society — 

 Yorkshire Geological Society — 

 Paisley Abbey — Fossil Mammals, 

 Crimea — Indian Geological Ter- 

 minology — Memoirs and Becords 

 of Indian Survey — Montana 

 Mining Districts — Fernando 

 Fossils in Sandstone— Calif ornian 



Miocene Mollusca ... 87 



III. Beports and Proceedings. 



Geological Society — 



December 16, 1914 



January 6, 1915 



January 20 ... 



Geologists' Association 



Edinburgh Geological Society 



Liverpool Geological Society 

 Obituary. 



ArthurBoopeHunt, M.A. (Cantab 

 F.L.S. , F.G.S 



96 



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