68 



BOREAL PROVINCE. 



great sea-weed belt, he recognizes four regions. 

 The highest of these is the region of Balani, where 

 the barnacles grow in such numbers on the rock- 

 side as to belt the coast, when the tide is out, with 

 a white girdle. The second is the region of Lim- 

 pets, at the upper bounds of which the sea-weeds 

 Fucus vesiculosa and Fucus nodosus grow, and, 

 lower down, Fucus serratus and siliquosus; in this 

 region are seen numerous littoral shell-fish, species 

 of Littorina, Patella vulgata, and, less plentifully, 

 the tortoiseshell limpets {Acmcea testudinaria), Pur- 

 pura lapillus and My tilus edulis, the common mussel. 

 Also, shell-framing annellides of the genus Spirorbis 

 and red Actinece, probably A. mesembryanthemum. 

 Many Gasteropoda and Ascidioe live here. His 

 third belt is the region of Corallines, meaning by 

 that term the pretty calciferous sea-plant, Corallina 

 officinalis. This is the home of the horse-mussels 

 (Modiola modiolus), of the large and showy Actinia 

 coriacea, of Lucernarice, Ascidians, sponges, and 

 Alcyoniums. In sandy portions of this region 

 numerous soft worms live (Arenicola, Nephtys, 

 Terebellum, Cirratulus and Aricia), and, burying 

 in the sand, we have bivalve shell-fish, of the genera 

 My a and Solen — to use their popular names, gapers 

 and razor-fishes. This is the home of Ciona in- 

 testinalis and Eolidia papillosa. The fourth, and 

 lowest of these coast-line belts, is the region of 

 Laminariae, of the great sea-flags or tangles, which 

 lies beyond the lowest ebb. On the frond of these 



