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The solid protuberances have been described in detail by Dr. 'Ueber die Schadelhocker, etc., 'Niederland.
But with domesticated sheep the presence or absence of horns is not a firmly fixed character; for a certain proportion of the merino ewes bear small horns, and some of the rams are hornless; and in most breeds hornless ewes are occasionally produced. Dr. 'Uber die knochernen Schadelhocker der Vogel, in the 'Niederland. Archiv fur Zoologie, B.i.
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