. Bulletin of the British Museum (Natural History), Geology. ON THE SKULL OF OLIGOKYPHUS 73 these fragments does not show two right-angled bends in the base of the skull ; a sagittal section of the ventral surface of the basioccipital and the basisphenoid would form an S-shaped curve, the ventral surface of the basisphenoid being lower than that of the basioccipital. Both and show a duct () through the lateral wall of the brain-case just above the paroccipital process (Text-figs. 2, 6), its external opening lying close to the anterior opening of the post-temporal fenestra (pt
. Bulletin of the British Museum (Natural History), Geology. ON THE SKULL OF OLIGOKYPHUS 73 these fragments does not show two right-angled bends in the base of the skull ; a sagittal section of the ventral surface of the basioccipital and the basisphenoid would form an S-shaped curve, the ventral surface of the basisphenoid being lower than that of the basioccipital. Both and show a duct () through the lateral wall of the brain-case just above the paroccipital process (Text-figs. 2, 6), its external opening lying close to the anterior opening of the post-temporal fenestra (). According to Brink (1955), a similar foramen is present in cynodonts (Text-figs. 10, 12) ; while Ginsburg (1962 : 188-189) described a similar duct in the tritylodontid Likhoelia ellenbergeri, and named it the floccular canal. ^ -w. Fig. 6. Oligokyphits sp. Reconstruction of the brain-case, in lateral view. Key to lettering, p. 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 British Museum (Natural History). London : BM(NH)
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