. Bulletin of the British Museum (Natural History) Geology Supplement. ESPECIALLY MYCTOPHOIDS 15 SOS c. epo inf. op. Fig. 5. Ichthyotringa delicata (Hay). Neurocranium in dorsal view. The anterior end of the snout is absent and the broken line on the right side of the figure indicates the course of the sensory canals. From orbital sensory canal passed forwards within the pterotic to enter the sphenotic. After contacting the supraorbital sensory canal in the frontal the infraorbital canal passed through the sphenotic laterally and down into the last i
. Bulletin of the British Museum (Natural History) Geology Supplement. ESPECIALLY MYCTOPHOIDS 15 SOS c. epo inf. op. Fig. 5. Ichthyotringa delicata (Hay). Neurocranium in dorsal view. The anterior end of the snout is absent and the broken line on the right side of the figure indicates the course of the sensory canals. From orbital sensory canal passed forwards within the pterotic to enter the sphenotic. After contacting the supraorbital sensory canal in the frontal the infraorbital canal passed through the sphenotic laterally and down into the last infraorbital bone. The sphenotic projects laterally from the frontal. The greatest width of the neuro- cranial roof is between these extremities of the sphenotic extensions. The sphenotic also inclines ventrally. Dorso-laterally the upper surface of the sphenotic is ex- cavated for the reception of the last infraorbital bone. The pterotic forms the postero-lateral edge of the skull-roof and extends consider- ably on to the roof. Antero-medially the pterotic is covered by the backward exten- sion of the frontal, but postero-medially it overlaps the lateral edge of the parietal forming the roof of the post-temporal fossa. The pterotic contacts the sphenotic anteriorly and the epiotic posteriorly, the supratemporal lying dorsal to the junction with the epiotic. The dorsal surface of the pterotic is smooth but dorso-laterally several elongated pores open into the tube which housed the otic branch of the infra- orbital sensory canal. The most posterior pore is the largest and received the sensory. 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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