DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
A group of garden snails, Helix aspera, attached to the surface of a sheet of glass, seen from the underside. The picture shows the large muscular foot that is characteristic of snails. The foot secretes a slime that lubricates the motion of the animal and also provides adhesion where necessary ( as here ). In this picture, each of the four feet visible is slightly elongated. The more pointed end of each ( mostly clearly above right, blue hue) is at the rear of the animal as it is preparing to move. At the front, the foot shows a cavity. This is the site from which the head is about to emerge. Because of the continuous nature of the tissue comprising the sole and the head, it is called the cephalopodium ("head-foot").
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