. Bulletin of the British Museum (Natural History) Geology Supplement. FOSSIL AND RECENT 73 is significant that the anterior border of the subtemporal fossa is ill-defined since this invites comparison with Tarpon. The ventral border is clearly demarcated by a prominent prootic-intercalar bridge which stands clear of the underlying exoccipital, leaving a small foramen between the bridge and the lateral cranial wall. Beneath the subtemporal fossa the exoccipital contacts the basioccipital ventrally and the prootic anteriorly. At the junction of these three bones there is a shallow depression. T
. Bulletin of the British Museum (Natural History) Geology Supplement. FOSSIL AND RECENT 73 is significant that the anterior border of the subtemporal fossa is ill-defined since this invites comparison with Tarpon. The ventral border is clearly demarcated by a prominent prootic-intercalar bridge which stands clear of the underlying exoccipital, leaving a small foramen between the bridge and the lateral cranial wall. Beneath the subtemporal fossa the exoccipital contacts the basioccipital ventrally and the prootic anteriorly. At the junction of these three bones there is a shallow depression. The depressions of either side are only separated from one another by a double layer of bone and consequently the saccular recesses must have lain above these depressions, as in Tarpon. The exoccipital is pierced by two foramina. The larger of these, the vagus foramen, is situated beneath the intercalar and directed postero-ventrally. The smaller glossopharyngeal foramen faces antero-ventrally and is situated in front of and somewhat below the level of the vagus foramen. The intercalar overlies part of the exoccipital laterally and part of the exoccipital, pterotic and epiotic posteriorly. Much of the intercalar is sutured to the exoccipital. Anteriorly the intercalar is produced as a thin rod to meet a similar projection from the prootic so forming the prootic-intercalar bridge. Posteriorly the intercalar bears a small knob, bordered dorsally and ventrally by grooves, the ventral groove being particularly prominent. The knob of the intercalar probably provided an insertion point for a tendon from the post-temporal. The prootic forms much of the lateral wall of the otic region and is pierced by three large foramina. Ventrally there is a downwardly directed foramen for the orbital artery, dorsally a large upwardly facing hyomandibular foramen, while beneath the prootic region of the prootic-intercalar bridge is the posterior opening of the pars jugularis. This latter epo pr soc.
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