S i m m o n s , R emarks about the Relations of tbe Floras etc. 1 G 1 
and collectors, who have brought the knowledge about this part 
of the arctic regions far beyond that we have of most others. 
The scantiness of the list from the Siberian Polar Sea doubtless 
is caused in a great measure by the nature of the coast, that 
is unfavourable for the growth of algae (cf. Kj eil man, 30, p. 7, 
20 etc.), but then this long coast is almost only explored during 
one sole voyage, the Vega-expedition. On the american side I 
think only exploration is lacking; many parts of the coast of 
the continent as well as of the islands are favourable enough, 
but here a great work is still left undone. 
However, for the investigation here contemplated, there is 
another point of view of still greater importance than the num- 
bers of species in the different districts. That is the distribu- 
tion of the species in those districts, which is summarized in the 
following table. 
Table III. 
Distribution of species 
Pliaeo- 
phyceae 
Rhodo- 
phyceae 
Total 
1. In all arctic districts 
9(10) 
8(9) 
17 (19) 
2. W. Greenl., Spitzb. prov., Asiatic Pol. Sea 
5 
2 
7 
3. — — — Amer. — — 
10 
5(6) 
15 (16) 
4. — Asiat. Pol. Sea — 
0 
0 
0 
5. Spitzb. prov. — — — — — — 
0 
3 
3 
6. W. Greenland, Spitzbergen prov. 
23 
19 
42 
7. — Amer. Polar Sea 
0 
1(2) 
1(2) 
8. — Asiat. — — 
0 
1 
1 
9. Spitzbergen prov. — 
0(1) 
3 
3(4) 
10. — — Amer. — 
0 
0 
0 
11. Asiatic Polar Sea — 
0(1) 
0 
0(1) 
12. W. Greenland 
19 
8 
27 
13. Spitzbergen province 
11 (12) 
17 
28 (29) 
14. Asiatic Polar Sea 
2 
2 
4 
15. American — — 
i 
3 
4 
84 
75 
159 
I have here also included such combinations of distribution, 
as, although theoretically possible, are not found in reality. It 
is however of some importance to observe as well the lacking 
of these as also the number of species for eaeli existing com- 
bination. 
Beihefte Bot. Contralbl. Bd. XIX. Abt. II. Heft 1. 
11 
