CHITON, in zoology, a genus of the order of vermes testaceæ. The name chiton is from chiton, Loricæ, a coat of mail. The shell is plated, and consists of many parts lying upon each other transversely: the inhabitant is a species of the noxis. They are common on the shores of Scarborough, Aberdeen, and Lochebroom. See several species represented of their natural size on Plate CXXXVIII.