A tube of whirling air formed over the platform.
In the prosoma, this tube is wider and forms the sucking stomach.
The tubes form the sides and bottom of the bags.
Two tubes form elipses; two thrust toward the ground and out into space.
In birds, however, the tubes form a random pattern, more like the cracks of a dried-up lake bed.
Here filaments of opposite gender line up, and tubes form between corresponding cells.
The tubes form the first barrier against release of radiation into the plant and the environment.
A tube formed through the centre of the tree.
The tubes formed a grid network throughout the cylinder, providing access to all sections of the interior.
In some cases concentric tubes form, one inside another.