"One lies upturned on the sand. Its tail sake waggles feebly, quite unable to perform the task of turning the body back over again. Five paris of legs twitch ineffectually in a vain attempt to achieve the same end. I find it impossible to resist the temptation to right the poor animal. It is easy to grasp it by the edges of the head-shield. Once righted again those spindly legs allow the crab to trundle slowly away. Its behaviour seem at once strangely determined, but also apparently random, like the slow progress of a confused old lady on a ."