The whole of this tribe of animals have the body covered with a hard and strong shell, and they live chiefly in the sea. Some, however, inhabit fresh waters, and a few live upon land. They feed variously, on aquatic or marine plants, small fish, molluscae, or dead bodies. The black-clawed species is found on the rocky coasts of both Europe and India, and is the same that is introduced to our tables, being much more highly esteemed as a food than many others of the tribe. The most remarkable feature in their history, is the changing of their shells, and the reproduction of their broken claws. The former occurs once a year, usually between Christmas and Easter, when the crabs retire to cavities in the rocks, or conceal themselves under great stones. Fishermen say that they will live confined in a pot or basket for several months together, without any other food than what is collected from the sea-water; and that, even in this situation, they will not decrease in weight. The hermit crab is another of the species, and has the peculiarity of taking possession of the deserted shell of some other animal, as it has none of its own. This circumstance was known to the ancients, and is alluded to in the following lines from Oppian:--
The hermit fish, unarm'd by Nature, left
Helpless and weak, grow strong by harmless theft.
Fearful they stroll, and look with panting wish
For the cast crust of some new-cover'd fish;
Or such as empty lie, and deck the shore,
Whose first and rightful owners are no more.
They make glad seizure of the vacant room,
And count the borrow'd shell their native home;
Screw their soft limbs to fit the winding case,
And boldly herd with the crustaceous race.
The hermit fish, unarm'd by Nature, left
Helpless and weak, grow strong by harmless theft.
Fearful they stroll, and look with panting wish
For the cast crust of some new-cover'd fish;
Or such as empty lie, and deck the shore,
Whose first and rightful owners are no more.
They make glad seizure of the vacant room,
And count the borrow'd shell their native home;
Screw their soft limbs to fit the winding case,
And boldly herd with the crustaceous race.
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