. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 54 ANNALS OF THE SOUTH AFRICAN MUSEUM canal pineal fosse flocculaire paroi mediate de I'oreille interne. Fig. i. Longitudinal section of the posterior part of the skull of Gorgonops tonus ( 277), reconstructed from serial sections (from Sigogneau 1970). X 1. f h: hypophyseal fossa. also traversed this opening. The latter, in conjunction with the cavity of the bony ear, correspond to the vestibule of some authors, but it would be prefer- able, as noted by Romer (1955), to avoid this term origina
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 54 ANNALS OF THE SOUTH AFRICAN MUSEUM canal pineal fosse flocculaire paroi mediate de I'oreille interne. Fig. i. Longitudinal section of the posterior part of the skull of Gorgonops tonus ( 277), reconstructed from serial sections (from Sigogneau 1970). X 1. f h: hypophyseal fossa. also traversed this opening. The latter, in conjunction with the cavity of the bony ear, correspond to the vestibule of some authors, but it would be prefer- able, as noted by Romer (1955), to avoid this term originally applied to the upper part of the internal bony ear. The absence of ossification is such that the interior of the horizontal semicircular canal, contained in the lateral wall of the ear, is visible mesially; the canal, nearly totally lacking an internal wall, seems to open into the utriculosaccular cavity. The same absence of ossification is responsible for the opening of the vertical anterior semicircular canal into the bony floccular fossa. Indeed, intruding between the elements of the inner ear was an enormous flocculus (o),2 directed postero-laterally after having passed anteriorly under the anterior semicircular canal. This flocculus must have been remarkably developed, and even partially covered the crus communis canalium. Opening anteriorly into the cerebral cavity, the floccular fossa penetrates first the prootic, which surrounds it on three sides; at the same time its floor, oblique ventrally and toward the median line, progressively rises until it becomes horizontal. But soon the supraoccipital invades both the roof and the floor, and when the fossa closes mesially (section 278 A), it is nearly completely included in the supraoccipital; it narrows progressively within this bone and terminates 1,5 mm behind its mesial closure. 2 This and following numbers refer to features in the Please note that these images are extracted from scanned page images that may
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