TUBE-MAKERS. 323 



closed at its posterior extremity, exhibits a cir- 

 cular opening in front, which serves as a kind 

 of window through which these hermits are en- 

 abled to take a view of the world around them, 

 to seize upon any prey which may happen to 

 pass in their way, and to expose their blood to 



FIG. 64. TUBE-WORM (Terebella conchilega). 



the vivifying action of the water, which serves 

 them in the place of the air which we breathe. 

 Do not, therefore, accuse them of curiosity or 

 coquetry, because you see them so constantly dis- 

 play their richly-ornamented heads. But rather 

 take advantage of this habit engendered of necessity, 



Y 2 



