Lobworm, or LUGWORM (Arenicola piscatorum), one of the more sedentary Chætopods, extremely abundant on the British shores, and very valuable as bait. It lives head downwards in a hole in the sand, which is partly lined by a yellowish-green agglutinating secretion from the skin of the worm. The hole is made as the animal eats its way in earthworm-like fashion, and the devoured material, from which small organisms and organic debris are extracted, is passed out on the surface as spiral coils or 'casts,' familiar to every one who has walked over a low-tide stretch of sand. The animal is larger than the earthworm, sometimes a foot in length, and greenish brown in colour. The body is divided into a thickened anterior region, a median part with thirteen pairs of gill-tufts brightly coloured by the red blood, and a thinner posterior portion. The appendages are degenerate, but are represented by two rows of weak bristles on to the end of the gill-bearing region.
