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CRUSTACEA 



CHAPTERS I AND 1 1 1- VI I 



GEOFFREY SMITH, M.A. (Oxox.) 



Fullosv of New College, Oxford 



CHAPTER II 



BY 



THE LATE W. F. II. WELDON, M.A. (D.Sc. Oxox.) 



Formerly Fellow of St. John's College, Cambridge, and Linacre Professor of Human 

 and Comparative Anatomy, Oxford 



VOL. TV 



B 



