MARINE ALGAJ OP VANCOUVER ISLAND 
131 
Only relative value can be placed on these proportions, as 
allowances must be made for two considerations. (1) The re- 
gions with which we are making comparison are not all equally 
well known; if the Asiatic flora were as well known as that of 
Europe, its proportion in the above list would undoubtedly be 
larger. (2) In comparing this region with two other regions, 
one of which has a flora considerably richer than the other, the 
former would naturally show the larger percentage. If, how- 
ever, it were a question as to which of the other floras had a larger 
percentage of its species among those of the Vancouver region, 
the result might be the opposite. 
The general conclusions are something as follows: the Van- 
couver flora has more species in common with the region south 
of it than with the region north of it; this is to be expected, as 
the number of species generally grows smaller as we go from sub- 
tropical through temperate to Arctic regions. As regards 
brown algae, however, the number of species common to region 
1 is the same as that common to region 2, which indicates a 
closer relation to the former; as regards the red algae, the re- 
verse seems to be true. The per cent common to the American 
coast of the north Atlantic is less than that common to the 
European coast, and this holds good as to both brown and red 
species. It may be partly due to the European flora being richer, 
but that is probably not all ; some quite important species and 
genera appear to be common to the east sides of the two oceans, 
and missing on their western sides. 
GEOGRAPHICAL DISTRIBUTION . 
Phaeophyeeae. 
1 
2 
3 
4 
5 
Pylaiella littoralis 
... + 
+ 
+ 
+ 
-j- 
Dctocarpus siliculosus 
... + 
+ 
+ 
+ 
+ 
“ confervoides 
+ 
+ 
+ 
“ mucronatus 
+ 
“ granulosus 
+ 
+ 
Sphacelaria fusea 
+ 
+ 
+ 
+ 
Coilodesme calif omica 
+ 
Coipomenia sinuosa 
+ 
+ 
+ 
+ 
+ 
Seytosiphon lomentarius 
... + 
+ 
+ 
+ 
+ 
Phyllitis fascia 
... + 
+ 
+ 
+ 
