COLLECTING SEA-AVEEDS. 295 



{D. sanguinea), with tiifts of crimson leaves, exqui- 

 sitely thin, much puckered at the edge, and strongly 

 nerved. The Tridcea, whose leaves are smooth and 

 leathery, and of a dark brownish scarlet, is often the 

 companion of the former. Here, too, we find the 

 PhyUojjliora^ another weed of brilliant red hue, with 

 unnerved leaves much divided, giving origin to other 

 leaves, and tliese again to others. It is usually much 

 covered with the cells and shrubs of various species 

 of Polyzoa, exquisitely beautiful objects for the 

 microscope. The Gelidium corneum is another fine 

 red weed, commonly of small size and slender, but 

 prettily fringed with processes all round the edges of 

 the leaves. This and the preceding are very hardy 

 in confinement, and form very suitable j^lants for an 

 Aquarium. 



When we can no longer work at so low a level, 

 we recede to the slopes of the ledges yet uncovered, 

 and find other species in the quiet sheltered pools. 

 A weed is found here, growing in dense mossy 

 patches on the perpendicular and overshadowed edges 

 of the rock, which, when examined, looks like a 

 multitude of tiny oval bladders of red-wine, set end 

 to end in chains. This pretty sea-weed is called 

 Chylodadia articulata. 



Here also gTOws the stony Coralline, a plant bearing 

 some resemblance to that just named, in the peculiar 

 jointed form of its growth. Low-lying pools are 

 often incrusted with a coat of stony or shelly sub- 

 stance of a dull purple hue, having an appearance 

 closely like that of some lichens ; the cnist investing 

 the surface of the rock, and adliering firmly to it, in 



