. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. i i i PTR EPT PPE Fig. 5. Portland skull, British Museum R3164. Lateral view of skull fragment. Abbreviations: EPT, epipterygoid. FNT, foramen nervi trigemini. ICA, incisura columellae auris. PPE, processus pterygoideus externus. PTR, processus troehlearis. V, vomer. Elements of the Braincase and Otic Region Os basisphenoidenm The basisphenoid forms a small, roughly triangular element when seen in palatal view. It is bounded anterolaterally by the pterygoids and posteriorly by the basioccipital; the anterior apex of t
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. i i i PTR EPT PPE Fig. 5. Portland skull, British Museum R3164. Lateral view of skull fragment. Abbreviations: EPT, epipterygoid. FNT, foramen nervi trigemini. ICA, incisura columellae auris. PPE, processus pterygoideus externus. PTR, processus troehlearis. V, vomer. Elements of the Braincase and Otic Region Os basisphenoidenm The basisphenoid forms a small, roughly triangular element when seen in palatal view. It is bounded anterolaterally by the pterygoids and posteriorly by the basioccipital; the anterior apex of the triangle is rounded. A parasphenoid is not present as a distinct element, although it is possible that the remnants of one are fused with the basisphenoid. solenhofen specimen The posterior end of the basis- phenoid is essentially transverse. It is not raised, but gives the im- pression of a ridge due to the marked difference in angle between the ventral surfaces of the basis- phenoid and the basioccipital. PORTLAND SPECIMENS The posterior end of the basis- phenoid is very slightly concave, and raised into a low transverse ridge across the flat palatal surface of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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