Pick twelve boiled, hard-shelled crabs in as large pieces as possible; mix them in a salad-bowl with half a cupful of the white of celery or finely shred lettuce leaves, one pinch of salt, half a pinch of pepper, one tablespoonful of olive oil, and one and a half table-spoonfuls of vinegar. Refill six well-cleaned shells with the salad, and on each one lay a good teaspoonful of mayonnaise sauce (No. 206), sprinkled over with one hard-boiled, finely chopped egg, the yolk and white separated, some crab or lobster coral, and a teaspoonful of chopped parsley, every article to be used separately, so they have each a different color. Serve on a dish with a folded napkin.