A hermit crab, you know, lives on the seashore and takes possession of an empty snail shell for a house.
It comes partly out dragging its house with it, but if you disturb it, it draws back, sometimes quite out of sight.
This little larva lives in a house, too, but it is a house of its own making.
It is the larva of the caddice fly, or case fly.
Let us put one of these little sand cases in the saucer here.
Please fill the saucer about half full of water, John. Thank you.
Now, Mollie, I see you have picked up a fine big caddice case.
Put it in the saucer, and let us watch the larva crawl about.
