JUST ISSUED. 



RAY SOCIETY VOLUME FOR 1918. 



THE BEITISH FRESHWATER RHIZOPODA AND HELIOZOA. 

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

 P.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, 



SCIENTIFIC VOYAGES AND TRAVELS, Etc. 



Chiefly from the Libraries of the late Professor T. McKenny Hughes ana W. E. 



Balston, F.L.S. 



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



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