. Bulletin of the British Museum (Natural History) Geology Supplement. 98 ELOPIFORM FISHES SOC. exo 10 mm f uv Fig. 47. Osmeroides lewesiensis (Mantell). Neurocranium in posterior view. Based on of the post-temporal fossa. The horizontal semicircular canal within the pterotic is indicated externally as an arch-shaped swelling immediately beneath the hyo- mandibular facet. In posterior view the pterotic is seen to form part of the roof and the entire lateral border to the opening to the post-temporal fossa. The epiotic forms part of the dorsal and the entire medial margin of th
. Bulletin of the British Museum (Natural History) Geology Supplement. 98 ELOPIFORM FISHES SOC. exo 10 mm f uv Fig. 47. Osmeroides lewesiensis (Mantell). Neurocranium in posterior view. Based on of the post-temporal fossa. The horizontal semicircular canal within the pterotic is indicated externally as an arch-shaped swelling immediately beneath the hyo- mandibular facet. In posterior view the pterotic is seen to form part of the roof and the entire lateral border to the opening to the post-temporal fossa. The epiotic forms part of the dorsal and the entire medial margin of the opening of the post-temporal fossa. Internally the epiotic forms a small portion of the medial wall of the fossa. Dorsally the epiotic is produced as a rounded process which re- ceives the upper limb of the post-temporal. The posterior surface of the epiotic is deeply excavated, the excavation being continuous with that on the exoccipital and together forming a sub-epiotic fossa. The supraoccipital is pentagonal in posterior view. Dorsally this bone separates the epiotics while ventrally it partially separates the exoccipitals. There is a very small supraoccipital crest. Internally the supraoccipital is continued forward as two antero-lateral wings which form much of the medial wall of the post-temporal fossa of either side. The exoccipital meets its partner in the mid-line above and below the foramen magnum. Adjacent to the foramen magnum the exoccipital is produced posteriorly into a structure resembling a neural arch. The lateral face of the exoccipital forms part of the subtemporal fossa, the ventral edge of which is defined by a weak ridge on the exoccipital. Posteriorly, beneath the level of the intercalar, the exoccipital is pierced by the large, posteriorly directed vagus foramen. Smaller foramina. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustration
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