. Bulletin of the British Museum (Natural History). . gasc Fig. II. Pterotic (right), pterotic bulla, and the epiotic. (a) Median view, (b) Lateral view. The pterotic is ovoid in lateral outline, the narrower pole directed upwards; slightly below the equator, the bone bulges a little around the horizontal semicircular canal. Over its ventral third the bone is slightly bowed in the vertical plane, with the concavity facing inwards. The anteroventral angle is deeply notched, the notch being separated by a narrow vertical pillar from a large foramen immedi- ately behind it. In an e
. Bulletin of the British Museum (Natural History). . gasc Fig. II. Pterotic (right), pterotic bulla, and the epiotic. (a) Median view, (b) Lateral view. The pterotic is ovoid in lateral outline, the narrower pole directed upwards; slightly below the equator, the bone bulges a little around the horizontal semicircular canal. Over its ventral third the bone is slightly bowed in the vertical plane, with the concavity facing inwards. The anteroventral angle is deeply notched, the notch being separated by a narrow vertical pillar from a large foramen immedi- ately behind it. In an entire neurocranium the notch is closed anteriorly by the sphenotic, and forms the first of four foramina opening into the recessus lateralis. Through it the infraorbital and supraorbital laterosensory canals open into 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 British Museum (Natural History). London : BM(NH)
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Keywords: ., 1968, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
