This shews for instance, when compared with the numbers given for the 'Siboga' collection 

 on page 3 that out of the 44 species of Harpacticoida recorded, 1 7 of them were present at 

 Ceylon, 3 at the Maldives, and 3 had already been known from the Malay Archipelago. On 

 the other hand, out of the 85 species recorded by Cleve, 15 of them were apparently not 

 taken during the cruise of the 'Siboga'. 



No excuse is offered for the great length of the report, or for the delay in its preparation, 

 beyond the fact that, the chief object was to make it worthy of the energy of the part} 1 of 

 Dutch Naturalists who devoted so muc-h time to the investigation of the area, and of the 

 commendable example of the Dutch Government in meeting the expenses of the exploration, 

 alone with due consideration for the fulfilment of my official duties under Professor Herdman. 

 Many dissections had to be made in the course of the work. Each appendage was dissected in 

 regular order and mounted separately in the majority of the species so it must be obvious that time 

 was necessary to obtain useful prepara tions. The illustrations are so drawn, that the characteristic 

 features of each species can readily be detected, without undue crowding of the plates. The 

 plumose setae of the swimming feet and other appendages have, therefore, not been included 

 in many cases. The lengthy index, list of literature, and the extensive synonymy under some 

 of the species, are given with the view to facilitate the investigations of future workers. I am 

 deeply indebted to the Linnean Society, London, and to the Librarian, Mr. A. W. Kappel, for 

 the free use of the literature in the library, and also to many investigators for furnishing 

 reprints of their works on Copepoda. My father's experience and advice proved of the utmost 

 value in the difficult points that cropped up from time to time, and in the determination of 

 uncertain species. I am also deeply indebted to Professor Weber for his kindness in giving me 

 the opportunity of investigating this interesting collection of Copepoda, for his careful supervision 

 of the printing of the report, and for the very satisfactory photographic reproductions of the 

 plates from the original indian ink copies. 



Piel, Barrow in Furness, April 30, 1909. 



