Stone crabs. Crand side-ways and at rest dig the postura up in into the sand by the aid of the posturn swimming limbs are by pushing out the anterior limbs making the chelae. The moment two come into contact it is the sign of battle although they do not always take hold. Once after a case of run away. The anterior up-in is held high of away from the ground and the gill lappets are constantly in vibration. Lobster when at rest bend the posterior part of body tail under the body, lie somewhat on the ground but not prostrate with the chelae more or less open and beneath ad in part of the mouth. See once beyond.