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of truc littoral forms trom any large area that includes very shallow water with some suspicion. 

 Phyllothalestris mysis was described bj Claus from Mediterranean specimens, and has been 

 shewn to occur on the coasts of Britain, Norway and Ceylon. Rhynchothalestris rufocincta lias 

 been obtained by Dr. A. M. Norman, Professor G. S. Bradv and other investigators on various 

 parts of the British Coast, and by Professor G. O. Saks on the coast of Norway. I have a 

 rich gathering of Harpacticoida in my possession that was found in the washings from a mere 

 handful of calcareous and other algae collected on the dead coral-reef flats and Madrcporia 

 reefs in the Conflict Atoll, off the coast of New Guinea. Some of the species from this distanl 

 Island, which is of more recent origin than Ceylon, appear to be identical with forms occasionally 

 found in washings from invertebrata dredged in the Irish Sea. 



There is no doubt that the temperature of the sea at between iooo and 2000 metres 

 in the Malay Archipelago is nearly the same as that of the deep water of the North Atlantic. 

 Krümmel 1907, shews that the temperature of the deep water is much more uniform throughout 

 the world, than that of the surface. One is led to suspect, therefore, that when the Copepoda 

 of the world wide deep cold areas have been fully investigated, there may be a greater uniformity 

 in the distribution of some species than is known at present. Scattered observations are of great 

 value as a link in the chain of evidence, but until the chain be complete many pitfalls await 

 the theorist should he venture into explanations regarding the presence or absence of groups 

 without sufficiënt data to work from. 



The result of the various methods employed on board the 'Siboga' gives one a fair 

 idea of the Copepod fauna of the region investigated. A comparison of the deep forms with 

 those of the shallow water, or of the surface and bottom types near the land, and also the 

 conditions in the daylight and the dark can be obtained from the lists of Copepoda that were 

 present in each collection as shewn on pages 278 to 314. The greatest number of species 

 represented in a day surface gathering was 59. One night surface collection contained 64 species. 

 A vertical net haul at Station 141, from 1500 metres to the surface, contained the astonishing 

 total of 1 3 1 species of Copepoda. This is at least 1 1 more than was apparently present in the 

 whole of plankton from the Maldive area. The Horizontal cylinder catches averaged ^j species 

 per haul and the washings from dredged invertebrata 13 each. The following list gives the 

 averages for each of the series : — 



50 Day Surface Collections, average per sample 29 species. 



1 3 Night Surface Collections, average per sample 40 species. 



4 Hensen Vertical Net Night Collections, average per sample 49,5 species. 



1 1 Hensen Vertical Net deep Collections, average per sample . 88,7 species. 



4 Horizontal Cylinder Collections, average per sample . . .37 species. 



1 Fowler Closing Net Collection 28 species. 



3 Washings from Dredged Invertebrata, average per sample . 1 3 species. 



The three tables below give the number of species belonging to the families and divisions 

 that were represented in the 'Siboga' collection and are also recorded from Ceylon, the Maldive 

 area, and the Malay Archipelago (Cleve). 



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