JUST ISSUED. 



RAY SOCIETY VOLUME FOR 1918. 



THE BRITISH FRESHWATER RHIZOPODA AND HELIOZOA. 

 By J. Cash and G. H. Wailes, F.L.S., assisted by J. Hopkinson, 

 F.L.S., etc. Volume IV. Supplement to the Rhizopoda by G. H. Wailes, 

 and Bibliography by J. Hopkinson. 8vo. pp. xii + 130, with 6 plates. 

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No. 78. October, 1919. 



CATALOGUE OF IMPORTANT WORKS ON 



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GEOLOGY AND PALEONTOLOGY. 



ASTRONOMY, PHYSICS, AND ENGINEERING, 



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Woodward. F.R.S., who has given up his house in London. 



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