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The mysticete jugal (nialar) bone is loosely articulated and hence generally lost fromthe skull during maceration. Inspection of complete mysticete crania reveals a relativelyhigh incidence of congenital jugal bipartism. In such instances the jugal comprises an anterior major, and a posterior minor, element. This latter, developed from an independent ossifi-cation centre, is commonly lost during maceration, but its former presence is indicated bya characteristic pre-squamosal hiatus in the zygomatic arch. Thecondition is without functional significance.