A Monograph of the Greniis Abiria. ß9 



sizes and varicjus heights above the low water mark, on a ridge of 

 rocks which jutted into the sea sixty feet and was about thirty feet 

 across its widest point. Pool No. I at the highest level was about 

 15 feet above the low water mark; and No. VIII at the lowest 

 was nearly at the low water mark. No specimen of Alaria was 

 found in the pools higher above the mark, and a few plants (species 

 undetermined) were found " on the bottom in exposed position " 

 of pool No. VIII. From the result obtained by her, and after 

 consulting the floral features of the region, it is ascertained tliat 

 Alaria plants can not properly exist in quiet places, however well 

 it may be supplied with new water by constant irrigation. Harvey^) 

 remarked on A. esculent a : — ■'' The roughest water seems to be most 

 favourable to its existence." This is true for Alaria in general. 



A few exceptional examples to the general statement above 

 given, however, may also bo mentioned. Böegesex^^ observes on 

 the Faeröese Islands that A. Pylall seems to prefer somewhat 

 sheltered coasts, and Kjellmax^) also reports its occurrence in tide 

 pools of the littoral formation in the Norwegian polar sea. 



Describing the habitat of A. grandifolla J. Ag., Kjellman^) 

 says : — " The species is sublittoral, living generally at a depth of 

 2-15 fathoms. It is met with in the interior of deep bays as 

 well as on exposed coasts, in the latter case near the shore, some- 

 times, when the bottom is favourable, several miles off. It is on 

 rocky bottoms that it attains its greatest size. Living sometimes 

 alone in rather great numbers, sometimes in accompany with other 

 Laminar iacecc, it constitutes an essential element of the formation 

 of Laminariaceœ on the coasts of Spitzbergen and the west coast 



1) Haeveï : riiyc. Bjit., Pla'.e 79. 



2) BöEGESEN : Algae Vegeta'ion of the Faeröese Islands, p. 754. 



3) Kjellman : Algae of Arctic Sea, p. 215. 



4) Ditto, p. 217. 



