To understand something of the structure and the general habits of the sholtie, all that we require to do is to collect a few specimens from the beach and put them in a saucer with a little sea-water. They will swim about in a very active fashion, the swimming being performed by means of little fan-like appendages attached to the under part of the animal just where the swimmerets are in the lobster. By the vigorous strokes of these appendages the animal forces its way through the water. These appendages are, however, of use in another way; the gills of the animal are attached to them. Even when it is lying almost dry, or in water too shallow for swimming, these appendages can be seen to work regularly and rhythmically with a gentle flapping movement. Sometimes they stop working for a little and then begin again, but they are never long at rest. In this way currents of water are made to bathe the gills continually, and the flapping of the appendages is really a breathing movement. The walking legs are attached to the fore part of the body. Some of them point backwards, as has already been mentioned, and the animal prefers to crawl or run on its side. As a rule, too, it propels itself over the ground by jerking movements of its body, its tail being alternately curled up and then suddenly straightened out again. It is in this way that it wriggles over the stones and escapes into a place of safety when exposed. One of the most characteristic points about the sholtie is its habit of clinging to objects, especially if they afford a cover from the light. Drop a bit of seaweed into the dish where they are swimming, and in two or three minutes the sholties will all be found clinging to the under surface of the weed. We might indeed imagine that they had escaped from the saucer. They cluster like swarming bees round the smallest blade of seaweed, and it is only by turning over the weed that we can make sure that they are there. When exposed to full daylight they seem uncomfortable, and keep swimming about trying to find a hiding-place. It is only when they find something to cling to and to hide under that they really rest and feel at ease.