Scallops swim in a rather curious way, namely, by opening and shutting their valves over and over again. As often as they do this a jet of water is squirted out, and this acts on the surrounding water just like the jets which are squirted from the siphon tubes of the cuttle, and drives the animal along with some little speed. As it travels through the water it looks very pretty, for all round the edges of its shell it has a fringe of long feelers, which wave up and down in a most graceful way. By means of these it obtains its food. At the base of these feelers is a row of little black dots, which seem to be eyes. PLATE XV THE RADIATED SCALLOP (2) This is rather a rare shell, and if you find it lying upon the shore you will be fortunate. You may know it at once if you _do_ find it, for it only has six or seven ridges running down it, instead of about twice that number. It varies a good deal in colour, but is generally reddish brown, spotted and speckled with white. [Illustration: PLATE XV 1. THE VARIABLE SCALLOP. 2. THE RADIATED SCALLOP. 3. THE HUNCHBACK SCALLOP.] PLATE XV THE HUNCHBACK SCALLOP (3) It is very easy to see why this creature is called the “hunchback,” for although when it is quite small it is shaped just like other scallops, it alters in form very much as it grows bigger; so that really it sometimes looks as if it had been crumpled up when it was quite soft, and had never recovered from the squeeze. Besides this, the two valves are not alike, as they are in other scallops, for while one is always very deep and rounded, the other is nearly flat. So when the animal is alive it really has a kind of “hunchbacked” appearance; and if you found its two valves lying apart from one another you would hardly believe that they could both have belonged to the same creature. The colour of the hunchbacked scallop is white, mottled with brick-red. PLATE XVI THE SUNSET SHELL (1 and 2) This is a very “local” shell. That is, it is very common indeed in some places, so that you might pick up hundreds and hundreds in a few minutes, while in other places it is never found at all. The best place in which to look for it is a part of the beach where sand and mud are mingled together, and there you will be almost sure to find it. The name of “sunset” shell has been given to it because of the beautiful way in which the inside surface is coloured. Sometimes it is rosy pink all over; sometimes it is orange yellow; sometimes it has crimson streaks upon a whitish ground. But you can never look at it without being reminded of the evening sky after a very bright sunset. The outside of the shell, however, is always white and chalky-looking, and no one who saw the two valves fastened together as they are when the animal is alive would have the least idea how beautiful they really are.