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If you look at an anellida you will have to admit that it kind of looks like a tube, from the outside, right. Well inside the worm has a gut that is just as long and as straight as it is on the outside. And between the outer-skin and the inner gut there is the body medium, a mostly fluid filled series of chambers. This makes for a tube within a tube.
An earthworm's body plan is described as bilateral symmetry, meaning it has a distinct front and back with a left and right side that are mirrored. This body plan helps the earthworm move efficiently through the soil and feed on organic matter.
The body is built on the plan of "a tube within a tube." The inner tube is the straight-line digestive tract, extending from the slit-like mouth on the first segment to the anal slit on the last segment. The outer tube, forming the body wall, consists of two layers of muscle, the moist skin, a cuticle, and a secretion of slimy mucus. The fluid-filled cavity between the two tubes contains a well-developed circulatory system, a nervous system, numerous thread-like kidneys, and the reproductive organs. In fact, the worm is exceptionally well organized, more so than one would imagine from its lowly position in the animal world.
here:
http://www.tvdsb.on.ca/Westmin/science/snc2g1/worm.htm
All higher animals have the same structure. We have an external tube-like form from head to toe. Inside this, starting at our mouth, we have a digestive system that goes all the way through our body and ends at the anus. This is a tube inside of a tube.
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