Rinse the game hens inside and out and pat dry. Rub the game hens with the lemon; sprinkle with salt and pepper to taste.
Saute the garlic, parsley, green onions and celery in the butter in a skillet until the vegetables are tender. Stir in the crab meat, 1/2 teaspoon salt and pepper to taste. Stir in the bread crumbs. Add the half-and-half gradually, stirring until mixed.
Stuff the game hens with the crab meat mixture. Place in a baking pan.
Bake at 350 degrees for 45 to 60 minutes or until the game hens are cooked through, basting frequently with pan drippings.
Note: Variation - Substitute imitation crab meat for fresh crab meat.