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seas. Not even the Dysidea, which is most common on the
coasts of Norway and Great-Britain, is to be found here.
The Chalinece are rather numerously represented, and
especially is one species, identified by me as Chalina arbuscula,
much spread. It is found as well in the European Arctic Sea
and the Barenfs Sea as in the Behring Sea. Stili more
common than this species is the Cribrochalina variabilis, at least in
the Siberian Arctic Ocean and the Beaufort’s Sea. A few
specimens are from the limits of the Barenfs Sea and the Kara Sea.
The following group, very common in the arctic seas, is
represented by numerous specimens. I am sorry to say that I
have not been able to identify more than a few of them. The
rest I have described as new species, though one or other
may have been described before.
The group Suberit idince. is represented by several species
of which the Suberites montalbidus is the most common. It is
found in ali the seas west of Greenland as far as to the
Behring Sea. The new species Tethya sibirica is obtained only
in the Siberian Arctic Ocean and in the Beaufort’s Sea.
The following group, the Desmacidince, is represented by
very numerous genera and species, the greater part of them
being obtained in the seas west of Nova Zembla. Only a few
are found east of cape Tscheljuskin.
The Chalinopsinidce are very rare to the east of Nova
Zembla. Only one species, the Clathria Loveni, is obtained in
the Siberian Arctic Ocean.
The Geodia Baretti, the only representative of the group
Geodinidce, is very numerous in the sea east of Greenland.
The following abbreviations are used in this work:
Sp. = expedition to Spitzbergen 1872—1873.
N. S. = » » Nova Zembla 1875.
S. ~ » » Greenland 1883.
V. — » of the »Yega» 1878—1880.
The figures after the locality indicate the numbers of the
stations.
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