REPORT 



TO THE GOVERNMENT OF CEYLON 



ON THE 



PEARL OYSTER FISHERIES 



OF THE 



GULF OF MANAAR, 



BY 



W. A. HERDMAN, D.Sc, F.R.S., P.L.S., 



Professor of Natural History in the University of Liverpool. 



WITH SUPPLEMENTARY REPORTS 



UPON THE 



MARINE BIOLOGY OF CEYLON, 



BY OTHER NATURALISTS. 



Part IV. 



PUBLISHED AT THE REQUEST OF THE 



COLONIAL GOVERNMENT 



BY 



THE ROYAL SOCIETY. 



LONDON : 

 1905. 



