. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASICRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 263 The parasphenoidal rostrum is seen lying above the interpterygoid vacuity with its anterior end underlain by the vomers, which here carry a well-developed ventral keel. The choanae are seen to open posteriorly to the edge of the premaxilla into longitudinal grooves roofed by the vomers and flanked by the palatines. In B the adjacent bones have been removed to show the basicranial bones in ventral view. The basipterygoidal processes ar
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASICRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 263 The parasphenoidal rostrum is seen lying above the interpterygoid vacuity with its anterior end underlain by the vomers, which here carry a well-developed ventral keel. The choanae are seen to open posteriorly to the edge of the premaxilla into longitudinal grooves roofed by the vomers and flanked by the palatines. In B the adjacent bones have been removed to show the basicranial bones in ventral view. The basipterygoidal processes are still quite prominent. In C the above is seen from the side and the dorsum sellae appears to have its upper part formed by the basioccipital. The endocranial cavity (Fig. 55) In the accompanying figures the endocranial cavity is shown in outline in lateral and dorsal view. The brain cavity is long; wide and high posteriorly and low and narrow elsewhere. The parietal tube is short (6 mm) and its diameters small (4-5 mm) and the sella turcica shallow. The mes- and metencephala could have been well developed but the fore- brain could have had but a small volume. bo I. B mc<N Fig. 55. Dicynodon sp. 12217 X 1. The endocranial cavity reconstructed in outline from sections. A. Lateral view. B. Dorsal view. Sections (Fig. 56) I am reproducing here four sections from front to back to show the structure of the sphenoidal 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 : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
