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Hyposphene and hypantrum

We all know the hyposphene as an accessory intervertebral articulation
in the form of a posterior projection below the postzygapophyses, and
the hypantrum as a corresponding notch below the prezygapophyses, the
hyposphene of one vertebra fitting into the hypantrum of the next.
However, Riggs (1904), in the full description of _Brachiosaurus
altithorax_, consistently reverses these two terms.  For example, on
pp. 232-233 he writes:

        The mesial surface of the prezygapophysis curves
        rapidly downward and is continuous with the vertical
        articular surface of the hyposphene [should be
        hypantrum].  Similarly the articular surface of the
        postzygapophysis is continuous with the of the
        hypantrum [should be hyposphene] ... The hypantrum is
        also slightly expanded inferiorly so as to prevent a
        downward displacement of the prezygapophyses.

Does anyone know of other papers that reverse the sense of hyposphene
and hypantrum like this?  Is it a simple mistake, or did the terms
have the opposite meanings in the early 20th century?

 _/|_    ___________________________________________________________________
/o ) \/  Mike Taylor    <mike@indexdata.com>    http://www.miketaylor.org.uk
)_v__/\  "When the substitute enters the field of play [...] the player
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