66 



CORALLINES. 



pulled out to the extent of two or three inches, each 

 of which is furnished with a row of cells containing 

 polyps. 



Another is very elegant ; 

 it adheres by its tubes to 

 most kinds of shells, and 

 also to stones ; it grows 

 very erect ; and is fre- 

 quently infested with mi- 

 nute shells. It consists 

 of a central stem around 

 which several cells appear, 

 each one opening into it, 

 and being the tenement 

 of a separate polyp. This 

 coralline' rises to the 

 height of eighteen inches, 

 and is of common occur- 

 rence. 



Another example shows 

 a very different structure, 

 which the engraving re- 

 presents as highly magnified. This coralline, ob- 

 served on mussels and other shells, is common on the 

 southern coasts of England, and is to be found also 

 on those of Ireland and Scotland. It is frequently 

 seen attached to seaweeds by a flexuous, horny, 

 tubular fibre, in colour like mother of pearl, which 

 throws up at intervals plumous shoots, from an inch 

 to an inch and a half in height. They are very 



SERTULAEIA ABIETINA. 



