Boyer diss 2009 1046..

(1976: Pl. 9b) noted that the ectotympanic bone of the basicranium has a “suspended
ring” for attachment of the tympanic membrane that looks euprimate-like, which he
illustrated with stereophotographs of the P .tricuspidens Pellouin skull. He identified a
vidian foramen in the Pellouin skull, but did not illustrate this morphology. He confirmed
Russell’s previous suggestion that there is a laterally-positioned posterior carotid foramen
and canal, noting their presence in the Pellouin skull. He provided the first and only
photographic documentation of the course of the internal carotid plexus in P. tricuspidens
with a close-up, annotated stereophotograph of the right petrosal (Gingerich, 1976: Pl.
9c). He provided additional evidence that a stapedial artery was absent by observing (but
not clearly illustrating) that there exists a bony ridge on the promontorium ventral to the
fenestra ovalis that would have blocked the course of the artery. He also provided an
illustration of the P. anceps specimen, showing premaxillary/frontal contact (Gingerich,
1976: fig. 32), and overview stereophotographs of MNHN CR 125 (Gingerich, 1976: Pl.
8a-c), the Pellouin skull (Gingerich, 1976: Pl. 9a-c), and the frontal fragment from Berru
(Gingerich, 1976: fig. 34). He used the reconstruction from Szalay (1971) as a basis for
reconstruction of jaw musculature. Furthermore he used a lateral view of the brain
“outline” based on Szalay’s reconstruction along with a dorsal “outline” to estimate brain
volume (Gingerich, 1976: fig. 35a). Figure 33 of Gingerich (1976) is a redrawing of part
of figure 19 of Russell (1964) and represents the orbitotemporal region of Plesiadapis. It
is labeled with equivalent but different terms. The sutural patterns depicted are similar to
those in Russell’s figure, but differ with respect to the relationship of the palatine/frontal
suture to the postpalatine canal. Russell (1964) depicted the suture as entering the canal,
while Gingerich showed the canal to be completely within the palatine. Finally, in plate
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