RAY SOCIETY ISSUES for 1017 

 and 1919. 



GROVES (J.) AND BULLOCK-WEBSTER (G. B-i- British Charophyta. 



Volume i, Nitellese. pp. xiv + 142. 20 pJat^s. 8vo. Cloth. London, 



1920. £1 5s. net. 

 LUCAS (W. J.). Monograph of the Piitish Orthoptera. 8vo. pp. xii + 



264. With 25 plates (6 coloured). Cloth. London, 1920. £1 5s. net. 



THE BRITISH MARINE ANNELIDS. 



By Professor W. C. MclNTOSH, M.D., LL.D., F.R.S. 

 TO PURCHASERS OF VOL. Ill, PART II, 1 9 15. 



The Supplementary Issue of Coloured Plates to replace Uncoloured Plates 

 numbered LXXXVIII to XCIII may be had on payment of 6d. to cover 

 postage. 



Ajyplications to — 



DULAU & CO., Ltd. 



34-36 Margaret St., Cavendish Square, London, W. 1 . 



SCIENTIFIC BOOKS and SERIALS. 



JOHN WHELDON & CO. have the largest stock in the country of Books in all 



departments of Science and Natural History, also Transactions and Journals of Learned 



Societies, etc., in sets, runs, and single volumes or numbers. 



Libraries or Small Parcels Purchased. 



SPECIAL CATALOGUES : Geological, Botanical, Zoological, Entomological, 

 Ornithological, Chemical, Agricultural, Gardening, etc., 2d. each, post free. 



38 GREAT QUEEN STREET, KINGSWAY, LONDON, W.O. 2. 



Telephone: Gekrahd 1412. 



All Communications for the EDITOR should be addressed to 

 R. H. RASTALL, Esq., M.A., Christ's College, Cambridge. 



All letters for Dr. H. AYoodwaed, F.R.S. , may be sent to 

 Tudor Cottage, Clay Hill, Bushey, Herts. 



Books and Specimens to be addressed to the Editor as usual, care of 



MESSRS. DULAU & CO., LTD.. 34-36 MARGARET STREET, 



CAVENDISH SQUARE, W. 1. 



STEPHEN AUSTIN AND SONS, LTD., PRINTERS, HERTFORD. 



