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When Professor Nordenskiöld asked me to give a sketch
of the forms and. the distribution of arctic Hyperids, founded
on the rich materials he had himself brought together during
his different arctic expeditions, he thouglit it convenient at
the same tirne that a comparison should be made with the
corresponding forms of the antarctic region. In compliance
to his request the present treatise has been elaborated as a
first and far from complete contribution to the very interesting
question of the relationship of these imperfectly known pelagic
erustacea.
The materials usecl for the elaboration of this paper are:
l:o) The large collection of arctic and pelagic crustacea in
the Zoological State Museum in Stockholm, most liberally
placed at my disposal by Professor S. Lovén.
2:o) A most valuable collection of Hyperids from the
University Museum at Copenhagen, with the utinost.
bene-volence entrusted to me for examination by Professor
Japetus Steenstrup and Professor C hr. F. Lut. k en.
3:o) A rich collection of Hyperids, principally from the
Southern Seas, colleeted by the too early deceased
Cap-tain Georg von Schéele for the University Museum
at Upsala, and kindly forwarded to me by Professor
Tycho Tullberg.
4:o) The collection of Hyperids from »Musée du Jardin des
Plantes», in the most generous manner placed in my
hands for comparison by Professor Alphonse
Milne-Edwards.
In my opinion the limits of the zoo-geographical regions
must be taken more generally with regard to truly pelagic
ani-mals than regarding the inhabitants of the depths and the
shores. Therefore I sliall fix the Southern limit of the arctic
region at Lat. 60° N., and the northern limit of the antarctic
region at Lat. 50° S. Certainly a part of the Gulfstream will
73ti. IV. 35
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