182 



THE SEA SHORE 



Terebella, together with the sandy filaments that surround the 

 mouth of the tube, the remainder of the tube and its occupant 

 being beneath the surface, and the ground is often so hard and 



FIG. 119. TUBE-BUILDING WORMS : Terebella (LEFT), Serpula (MIDDLE), 

 Sabella (BIGHT) 



stony that a strong tool is necessary to dig it out ; but the work 

 entailed will be amply repaid if a perfect specimen be obtained 

 and placed for observation in the aquarium. 



The reader may possibly be acquainted with the tubes or cases 



