530 THE LUG-WORM. 
A species of Shell-binder is very common on the white mud of the lagoons of the Florida 
Reef. It is an interesting view, when gliding over the Reef in a boat, to look over in the 
shallow water and observe these creatures at work. They construct a tube about three-quarters 
of an inch diameter, and it projects about two inches above ground. Few objects of nature 
have arrested our attention with greater wonder than these tube-builders. Here we have a 
worm, of low organization, and, so far as intelligence is concerned, it might well be at the very 
foot of the animal scale. Here we have the creature picking up material around it to build a 
house. It not only picks up material, but it sedects, as a stone-mason does, the most suitable. 
A singular circumstance is, that it builds its tube exclusively (its hard parts) of the little lime 
fronds of caleareous algee—such as abound in the sand of the Reef. This algz grows abun- 
dantly among the corals. The leaves, or fronds, are small, oval dises, when alive, covered by 
green vegetable tissue. The worm selects the lime parts and lays them neatly in courses, just 
as a stone-mason lays his wall. The worm occasionally places a bit of sea-weed in the courses, 
to aid in concealing the walls. These will be seen introduced in various parts of the tube, 
falling over and quite effectively breaking up the artificial aspect of the structure, which thus 
serves as a protective resemblance to the surrounding weed-covered objects. What are our 
thoughts, in view of this exhibition of ‘‘intelligence’’ ina base worm! If nothing more, it 
reminds us that human knowledge is finite. The worm goes a step further,—and what addi- 
tional wonder do we not experience, when we see the creature hunt about for a bit of shell, an 
entirely different object, and bring it to the tube precisely as we have seen in the case of the 
trap-door spiders. Here the worm has a house. When he wishes to feed, he pushes his 
head against the shell door, which yields, and drops to its place when the worm retires. 
Once in the completed tube, the worm does not leave it entirely. Often the whole strue- 
ture is concealed by a large piece of alga so fastened to the top that it falls over the 
structure. 

Passrina from the tube-inhabiting worms, we now come to those which are free and able 
to move about at pleasure. 
No one who has walked on sandy coasts can have failed to notice the numerous worm- 
casts which appear in the sand, between high and low water, being most numerous where the 
sand is level, and becoming scarcer in proportion to the steepness.of the slope. Sometimes, 
when a large, marshy flat makes its appearance, which is never entirely dry even at low water, 
these worm-casts become so numerous that the foot can hardly be placed between them ; and 
even while the spectator is gazing on the wet sand, coil after coil of dark sand emerges from 
below, as if Michael Scott’s familiars were trying to fulfil their task of making ropes from 
sea-sand. 
These sandy coils are the casts of the LuG-worm, so valuable to fishermen as a bait, and 
which, when well settled upon the hook, and tipped with a mussel, prove most attractive to 
the whiting pout, rock cod, plaice, dabs, and other shore-loving fishes. At every low tide the 
fishermen’s boys may be seen busily digging for Lug-worms, or Logs, as they generally term 
these annelids, and in a populous spot they will fill their square wooden pails in a wonder- 
fully short time. 
As a number of Lug-worms lie in a box, covered with sand, mud, and slime, twisting and 
writhing about in continual movement, they have by no means an attractive aspect, and might 
even be thought repulsive. But if a single worm be taken from the mass, washed, and placed 
in a vessel of clear sea-water, it assumes quite a different aspect, and becomes a really beautiful 
and interesting creature. Its color is very variable, but usually is dark green and carmine, 
some specimens being almost entirely of the latter hue. Others, again, are nearly brown, and 
some of a deep red. 
Along the sides runs a double row of the wonderful bristles by means of which the creature 
is enabled to propel itself through the sand, and projecting from the back are thirteen pairs of 
light searlet tufts, which, on examination, are found to be the gills of the worm. These are 
most beautiful organs, and when magnified are seen to be composed of many tufts, like the 
branches of a thick shrub. 
