There is one member of the crab family for which the Latin name is Gelasimus, which means "laughable." He certainly is appropriately named, for he is a very queer little fellow. The male has one claw of immense size, the other being quite small. The big claw is brightly colored, and when he runs he waves it about as if he were energetically beckoning, or playing some very stirring tune on a violin; hence he is often known as a "Calling-crab" or a "Fiddler-crab."

Fiddler-crabs inhabit various parts of the world, and are usually found in large numbers on muddy or sandy flats left dry by the tide, where they may be seen hurrying over the sand or peering out of their holes, into which they immediately vanish when alarmed. The holes, which usually are about a foot deep, are made by the crab persistently digging up and carrying away little masses of mud or sand. When he is doing this the crab presents a very funny appearance. Scraping up a quantity of sand into a little heap, he grasps it with three of the legs on one side and hurries away with it to some little distance. Having deposited his load, he raises his eyes, which he can do quite effectively, as they are situated at the end of very long, slender stalks, peers curiously around, and scuttles back to the hole for another load of sand.