735 



of Myrionema, etc. Si m mon s reports that he has louiKi Ectocarpns 

 vehitinus, the parasite peculiar lo Himanthalia. 



The association seems to correspond with Hansteen's and 

 Boye's description of their »f///jja/j//jo//a- formation« on the west 

 coast of Norway. They both refer it to the Httoral region. Han- 

 steen characterizes it as follows (38, p. 350): »This formation forms 

 a sort of transition between the purely httoral and the purely sub- 

 httoral formations, as it is most often found both above, and espe- 

 cially below, the low tide mark.« This, however, seems to imply 

 that it grows at a somewhat lower level on the wesl coast of Nor- 

 way than on the Færoes. 



Boye's remark (6, p. 24) that the formalion »seems lo avoid 

 localities that are directly exposed to the surf«, does not agree 

 with what I have observed, as I have found it in piaces as exposed 

 as e, g. Store Dimon, Lille Dimon, Viderejde, Sumbo Holm, the 

 western and northern coasts of Stromo, etc. At Christianssund in 

 Norway I saw^ the ////7ja/j//irt/za-association growing on a very ex- 

 posed coast and agreeing in all particulars with that from the Færoes. 

 As pointed out by Hansteen, Kjell man has already (45, p. 34) 

 mentioned the //mj«n//jrt//o-associalion on the west coast of Norway. 

 With regard to the Færoes this association has been briefly des- 

 cribed by Simmons (1. c. p. 254). 



THE ALGÆ -VEGETATION OF THE POOLS AND GAVES. 



The algæ-vegetation of the lilloral pools, and that of the caves, 

 which are so abundant along the exposed coasts of the Færoes, 

 must be described separately. In both piaces the algæ grow under 

 very different conditions from those enjoyed by the olher algæ- 

 vegetation found at the same level. 



The Algæ -Vegetation of the Httoral Pools. 

 These pools must first be divided into two groups. 1) The 

 pools found at a height to which the sea cannot reach al high 

 tide, and which therefore cannot have their water renewed con- 

 slantly. 2) The pools within the limils of high and low lide, 

 and which are therefore connected with the sea at high tide for 

 a shorter or longer time. Consequently these two groups of water- 

 pools offer very different biological conditions lo the algæ. In the 

 low-lying littoral pools, the water will be conlinually renewed, 



