. o-^ 



Reports from the Ceylon Marine Biological Laboratory. 



Part VI.] Nos. 20 to 22. [Vol. I. 



SUMMARY OF CONTENTS. 



Introduction. By T. SouthweU, A.R.C.Sc. (Lend.), F.L.S., F.Z.S. 



No. 20.— Currents on the Ceylon Pearl Banks, Superficial and Deep. By T. Southwell, A.R.C.Sc. (Lon^. 

 F.L.S., F.Z.S. , and Lieut. J. C. Kerkham, R.N.R. 



No. 21. — Nautical Notes and Observations. By Lieut. J. C. Kerkham, R.N.R. 



No. 22. — A Description of Ten New Species of Cestode Parasites from Marine Fishes of Ceylon, with Notes on 

 Seven other Species from the same Region. By T. Southwell, A.R.C.Sc. (Lond.), F.L.S., F.Z.S. 



With three Plates and three Charts. 



INTRODUCTION. 



1. — History of the Laboeatorv. 



With the publicatiou of tlus Report (Part VI.) the Ceylon Marine Biological Laboratory ceases 

 to exist. In 1902 Professor Herdman was deputed by the Royal Society, on behalf of the Colonial 

 Government, to investigate the various problems relating to the pearl banks, and especially the reason 

 of the erratic nature of the fisheries. His five voluminous Reports are well known. The Reports from 

 this Laboratory were merely intended to supplement Herdman's Reports. 



After Professor Herdman had finished his investigations in Ceylon, Mi'. Hornell, wlio had acted 

 as Assistant to Professor Herdman during his stay in Ceylon, was left to continue tlie work on the spot. 

 The Ceylon Marine Biological Laboratory was thus founded. Its fiist headquarters were at Galle, but 

 were subsequently changed to Colombo, although the great bulk of the work has been done out at sea, 

 on board the barque " Rangasamee Porawee." In 1903 Mr. Hornell was appointed Marine Biologist to 

 the Ceylon Government ; dming his appointment the first two parts of the Reports from this Laboratory 

 were published. In 1905 the pearl banks were leased out to the Ceylon Company of Pearl Fishers. 

 Limited : Mi-. Hornell left tlie service of Government and took up duties as Manager of this Company. 

 The Ceylon Marine Biological Laboratory thus passed from the hands of Government and became 

 controlled and carried on entirely by the Company. 



In 1906 I came out to Ceylon as the Scientific Assistant to the Company. Earh^ in 1908 

 Mr. Hornell left the service of the Company, and I assumed full executive duties. Later in the year 

 Lieutenant J. C. Kerklxam, R.N.R., was appointed Superintendent of Fisheries, and the scientific work 

 devolved on me. TJiis arrangement continued up to the end of 1911, and it was dming this period that 

 Parts III., IV., v., and VI. Reports were published. It will be noted tiiat Parts I. and II. (which arc 

 .57-11 



