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to trace out the limits of the species. Also were rich, but
less interesting materials obtained from algse, collected near Cape
Deschnew. Several samples of the bottom-mud from the North
Siberian Sea were also taken, but in examining thein I could
not find a trace of diatoms. All the materials from the
expedition of the Vega have been examined by myself. Stili more
materials from the hyperboreal America were collected during
the British expedition under the command of Sir George
Nares and examined by Mr. G. Dickie1. Afterwards I have
received, through the kindness of Prof. Oliver, some of these
samples. Among them only three were rich enough to be
subjected to the usual cleaning-process, viz. from BesseVs Bay,
81° 7’ N, Miishroom Point, 82° 28’ N, and Discovery Bay, 81° 41’.
The resuit of my examination of these gatherings are to
be found in the foliowing pages. Also from the distant Franz
Joseph Lånd some diatomaceous gatherings have been
collected on the ice-fiakes during the Austrian expedition under
Weyprecht. Some of the species found by Mr. Grunow in
these materials have been published in Yan Heurck s
Synopsis and issued in Cl. and Möller Diat. No 314. Mr. Grunow
will later publish in a more complete manner his researches
in regard to these most interesting diatonis. The materials
brought together from the Arctic Sea are thus very considerable,
and their examination may give a tolerably complete idea of
the diatomaceous vegetation the Arctic Sea. I have therefore
tried to give in the following pages a complete list of all the
arctic species, found by myself and by-Mr. Grunow, omitting
those found by other authors, not beeing sure about their
determinations.
Index of marine arctic Diatoms.
A. Placochromaticse
I. Cocconeidae.
Cocconeis Scutellum Ehb. (Van Heurck Syn. XXIX, 1—12)
Greenl., Mushroom Point, Fr. J. L. Spitsb., Finm., Kara,
Cape Deschnew (East Cape).
1 Jour. Linn. Soc. Vol. XVII, page 6.
2 F. J. L. Franz Joseph Land according to Grunow.
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