ACKNOWLEDGMENTS 



It has not been possible to prepare all the illustrations from 

 specimens; a number have been copied from other sources, which 

 I am pleased to acknowledge below. 



The following authors have kindly given permission for me to 

 copy their original illustrations: Dr. D. Atkins, Dr. H. Barnes, 

 Professor H. G. Cannon, Professor R. Dennell, and Dr. H. Sanders. 



My thanks are also due to the Royal Society of London for per- 

 mission to reproduce figs, i and 19c (after D. J. Scourfield) and fig. 

 17 (after H. G. Cannon); to the Royal Society of Edinburgh for per- 

 mission to reproduce figs. 20 and 22 from volume 55 of the Trans- 

 actions of the Royal Society of Edinburgh, and fig. 21 from volume 

 59 of the same Transactions; to the Company of Biologists for per- 

 mission to reproduce fig. 41 from the paper by W. Burke in the 

 Journal of Experimental Biology (1954) volume 31 ; to the Zoological 

 Society of London for permission to reproduce fig. 48 (after J. Green) 

 and fig. 52 (after D. Atkins); to the University of Bergen for fig. 46 

 from G. O. Sars' Crustacea of Norway; to Messrs. A. & C. Black for 

 permission to reproduce fig. 35 from Caiman's section on Crustacea 

 in Lankester's Treatise of Zoology; and to Messrs. Methuen & Co. 

 for fig. 57 from Caiman's Life of Crustacea. 



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