. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. 4i4 ANNALS OF THE SOUTH AFRICAN MUSEUM developed into a large, broad plate which obscures the lateral opening into the pituitary fossa and the foramina for the Vth and Vlth nerves. The epiptery- goid here is more than twice as broad as in any known gorgonopsian and has the appearance of a cynodont epipterygoid. It differs from that known in Scymnosaurus and Scylacosaurus in having an expanded upper end in addition to a wide footplate, a condition reaching its greatest development in the later whaitsids (Boonstra, 1934
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. 4i4 ANNALS OF THE SOUTH AFRICAN MUSEUM developed into a large, broad plate which obscures the lateral opening into the pituitary fossa and the foramina for the Vth and Vlth nerves. The epiptery- goid here is more than twice as broad as in any known gorgonopsian and has the appearance of a cynodont epipterygoid. It differs from that known in Scymnosaurus and Scylacosaurus in having an expanded upper end in addition to a wide footplate, a condition reaching its greatest development in the later whaitsids (Boonstra, 1934). Of the Cistecephalus Zone Therocephalia, Euchambersia mirabilis (Boonstra, 1936) also shows the dorsally and ventrally expanded condition (fig. 13) but the shaft of the bone does not show much expansion. In the scaloposaurid Ictidosuchops intermedins (Crompton, 1955), however, the shaft is a broad one, and ends in a slightly more expanded dorsal portion which fits into a shallow- depression in the antero-dorsal wall of the prootic, consequently forming part of the true lateral wall of the braincase. The anterior extension of the footplate is long, but the posterior one is short. At the juncture of the posterior extension and the ascending ramus there is a shallow notch which most probably housed the maxillary or both the maxillary and mandibular branches of the trigeminal nerve (Crompton, 1955).. PTERYGOID' J PAROCCIPITAL QUADRATE RAMUS OF PTERYGOID Fig. 13. Euchambersia mirabilis. Lateral view of skull with dermal bones cut away. (After Boonstra, 1936.) EPIPTERYGOID. 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 South African Museum. Cape Town [etc. ] The Museu
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Keywords: ., bookauthorsouthafr, bookcentury1800, bookdecade1890, bookyear1898
