PREFACE jx 



Fischer, Jena, for Plates 34, 36, 71 bottom, 73 left, 74, from 

 the Reports of the Valdivia Expedition ; to the Cambridge 

 University Press for Plate 61 from The Desert and Water 

 Gardens of the Red Sea, by C. Crossland ; to Messrs. L. 

 Reeve & Co., Ltd., for text -figure 34 from Corals and Atolls, 

 by F. Wood-Jones ; to the Clarendon Press, Oxford, for 

 Plates 66, 68, 82, from the Quarterly Journal of Micro- 

 scopical Science ; to Herr B. G. Teubner, Leipzig, for Plate 

 70 from Professor A. Steuer's Planktonkunde ; to Messrs. 

 Methuen & Co., Ltd., for Plates 80, 89, from The Life oj 

 Crustacea, by W. T. Caiman ; to Messrs. Duckworth 

 & Co., Ltd., for Plate 84 bottom from The Great White 

 South, by H. G. Ponting ; to Messrs. Putnam's Sons, Ltd., 

 for Plate 94 from The Arcturus Adventure, by William 

 Beebe ; to the Chemical Catalog Co., New York, for 

 Plates 103 bottom, 104, 123 top, from Marine Products of 

 Commerce, by D. K. Tressler ; to the Director of the Govern- 

 ment Press, Cairo, for Plate 126 from the Report of the 

 Egyptian Fisheries, 1922, by G. W. Paget ; to Messrs. J. M. 

 Dent & Sons, Ltd., for Plate 124 from Reptiles and Batra- 

 chians by Boulenger ; to Messrs. W. R. Deighton & Sons, 

 Ltd., for permission to reproduce the original oil painting 

 by Mr. Harold Webb as Plate i. 



Of the remaining illustrations the photographs for Plates 

 106, 107, 108 and drawings for text-figures 7, 35, 38, 39, 

 40, 41, 42, 44, 46, 60, 64, were supplied by Dr. Yonge, 

 and the original paintings, drawings and photographs for 

 Plates 17, 37, 48, 51, 91, loi, 115, 117, 125, and drawings 

 for text-figures i, 14, 15, 23, 24, 25, 26, 51, 52, 54, and 55, 

 by Mr. Russell. 



Finally our greatest indebtedness is due to Mr. W. J. 

 Stokoe for the preparation of the many coloured plates, the 

 half-tone plates and text-figures. 



We wish to record our gratitude to him for the great skill 



