SEA-WEEDS. 



151 



on rocks in the sea, usually at the margin of those 

 pools and hollows which are always filled with 

 water by each returning tide. Equally common 

 too is the Red Ceramium (Ceramium rubrum), 

 with its pale pink fronds, with stems and branches 

 about as thick as coarse threads. But we must 

 pass it by as difficult of description, and proceed 



to another frequent plant of the genus, which will 

 be recognised by the accompanying illustration. 

 This is the Ciliated Ceramium ( Ceramium cilia- 



