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Conclusions.
From the above enumeration it results that
l:o) the genus Euthemisto (and possibly also Hyperia) is common
to both the arctic and the antarctic regions; as it has only
few representatives in the Northern and Southern temperate
regions and none in the tropical, its centra of
develop-ment are most likely to be searched for in both the frigid
zones;
2:o) the genus Lanceola is a true arctic form with only a few
emigrants in the Northern temperate region;
3:o) the genera Hyperia and Parathemisto are cosmopolites,
prob-ably to be found in all the seas;
4:o) the genus Cyllopus is a true antarctic form with its centre
in the American Antarctic Ocean;
5:o) the genus Hyperiella is a connecting link between Hyperia
and Euthemisto, with same centre as Cyllopus’,
6:0) tlie genus Hyperoche is an arctic form with its centre in
the European Arctic Ocean;
7:o) the genera Vibilia, Thaumatops, Mimonectes and Tryphcena
are occasional immigrants into the arctic region from the
tropical and temperate regions, probably to be found
oc-casionally also in the antarctic region (except Mimonectes);
8:0) the genera Anchylomera and Thamyris are occasional
immigrants into the antarctic region, not likely to be found in
the arctic realm.
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