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records 85 species from the Malay Archipelago in his report published in 1901. Dr. RecN: 
WOLFENDEN reports on 118 species from the plankton collected by J. Srantey GarDINER around 
the Maldive and Laccadive Islands. Professor W. A. Herpman’s collections from the Gulf of 
Manaar 1902—1903 produced 195 species. 
The following table gives the families and divisions represented in the present report, 
with the number of species belonging to each, and shews the difference between the results 
obtained from the investigations of the ‘Siboga’ when compared with the parts of the Indian 
Ocean referred to. 
‘Siboga’ Ceylon Maldive Area Malay Archipelago (CLEVE) 
Galle One wite aM ape inn Peele 10) ris) Fam ot, Reman meno erntcl ©) ecu gRimey eat umn cg Sic) 
Mormonillidae . Tee meee tote fe eee Se ees 
Oninomcdae 3, Ren Sieg, CARO Se aoe Te oar Neat aie 5 
pig mC EL CONda wr at Aare gh O2 2.) vy a. aha is ae Wo Naar Cone ials 
Nionstiillidaic ea ssTO.e ee, 7. |. NOS aes = I 
@neacidaca =» Oe ee TOR ee 5 
Woleaciclc gramme Wel ONen aD A ae i ee uel 
SOjoolameaeres, 9 as Mee Sheth oats Ce Reta By ce tae ANG 
Lichomolgidae . A are ae en eee Ie) 
Clausiidae . I sel eae: De yen) Alte ee kei 
hotalen aa wea S 195 118 Se 
None of the above lists are strictly comparable with each other, as the methods employed 
in collecting the material were not identical in every case. For instance: — No vertical hauls 
with the HeNnsen net were taken in the Gulf of Manaar. During the ‘Siboga’ expedition fifteen 
such hauls were taken from depths between 10 metres and 2000 metres. On the other hand 
we examined seven collections of washings from invertebrata dredged around Ceylon, compared 
with the three in the present report. WoOLFENDEN does not give any information about the 
methods employed by J. SrantEy GARDINER in taking the collection of Copepoda from around 
the Maldive and Laccadive Islands, nor are the exact positions given for the occurrence of 
the species although the two groups of Islands are roughly 200 miles apart. The species 
recorded by WoLFENDEN, are such as would lead one to suspect that the Copepoda were 
obtained from at or near the surface, and at no great distance from the Islands. The collection 
reported on by the late Professor CLEVE appears to have been purely a surface series. 
Unless one can deal with Copepoda that have been collected by similar methods in 
different areas for some considerable period, it would be pure speculation to attempt to explain 
the differences that are apparent in the four series given above, and any conclusions put forward 
must necessarily be fallacious to a very considerable extent. It is hopeless at present, for instance, 
to compare the Copepod fauna of the sea along the coast of Western Europe, with that of 
almost any other part of the world. The Copepoda of the seas round Northern and Western 
Europe have been investigated by different observers for nearly a century, and yet a dozen 
years ago not even the most optimistic student had any idea that the very deep region to the 
West of Ireland and North of Scotland, was populated with so many interesting species as 
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