. Bulletin of the British Museum (Natural History) Geology Supplement. FOSSIL AND RECENT 75 pto mx. sop Fig. 38. Protarpon priscus (Woodward). Cranium in left lateral view. Based on holotype. Ventrally the margin of the jaw exhibits a slight inflexion. The surface of the bone in this region is marked by coarse rugae. The dentary forms most of the lower jaw, but posteriorly the articular is produced into a prominent process. The mandi- bular sensory canal pierced the posterior edge of this process and ran through the mandible opening by small pores which become more numerous nearer the dentary
. Bulletin of the British Museum (Natural History) Geology Supplement. FOSSIL AND RECENT 75 pto mx. sop Fig. 38. Protarpon priscus (Woodward). Cranium in left lateral view. Based on holotype. Ventrally the margin of the jaw exhibits a slight inflexion. The surface of the bone in this region is marked by coarse rugae. The dentary forms most of the lower jaw, but posteriorly the articular is produced into a prominent process. The mandi- bular sensory canal pierced the posterior edge of this process and ran through the mandible opening by small pores which become more numerous nearer the dentary symphysis. Circumorbital series. The bones of this series are thin and marked only by faint radiating ridges. The first infraorbital is rounded anteriorly and bears a small dorsal prominence which lies posterior to part of the trapezoidal antorbital bone. The antorbital is considerably larger than, and of a different shape from, that element in Tarpon and Megalops. Beneath the orbit the infraorbital bones are narrow but the extent of the second cannot be seen. The third, fourth and fifth members of the series are broad, extending posteriorly over the preoperculum. The infraorbital sensory canal runs within the infraorbitals close to the orbital margin, giving off short branches posteriorly. Within infraorbital 1 these branches are numerous and directed posteriorly. Opercular series. As a consequence of the posterior quadrate/mandibular articula- tion the preoperculum is composed essentially of a ' vertical' limb. The bone is. 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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