Worms 71 



its borrowed shell and its meals. The 

 big Lug Worm (Arenicola marina) the 

 popular bait is a burrower, and makes 

 the well-known worm castings seen on 

 all sandy shores at low tide, and which, 

 like the castings of our common or 

 garden worm, are simply composed of 

 waste matter passed through the crea- 

 ture's lengthy alimentary system. Whilst 

 the lug worm is content merely to hide 

 itself in the sand, many worms mingle 

 the sand with carbonate of lime ob- 

 tained from the sea-water, converting 

 the resulting mixture into serviceable 

 dwellings. In a few cases the tubes are 

 formed of sand saturated with a 

 glutinous secretion. The so-called Sand 

 Mason (Terebella conchilega) forms the 

 stubble-like stalks often seen protruding 

 from the sand at low tide, whilst the 

 Comb Worm (Pectinaria koreni) makes a 

 long thin tube as straight and rigid as 

 a pencil. All protrude tufts which are 



