. Bulletin. Natural history. 54 PEABODY MUSEUM BULLETIN 38 ffAsal grmV + VIH. ff md V f^ ea I gr2 Fig. 21. Dipnorhynchus sussmilchi. Ventrolateral aspect of lower jaw. Specimen P 13837, National Museum, Melbourne. Semidiagrammatic representation of vascular and nervous foramina and grooves in the jaw. Solid black indicates structures in or on Meckelian bone, stippling indicates grooves on the inner surface of external dermal bones. Finally, on both sides of P 13837 there are four small foramina situated on the posterior face of the mandible near the junction between the postsplenial and spleni
. Bulletin. Natural history. 54 PEABODY MUSEUM BULLETIN 38 ffAsal grmV + VIH. ff md V f^ ea I gr2 Fig. 21. Dipnorhynchus sussmilchi. Ventrolateral aspect of lower jaw. Specimen P 13837, National Museum, Melbourne. Semidiagrammatic representation of vascular and nervous foramina and grooves in the jaw. Solid black indicates structures in or on Meckelian bone, stippling indicates grooves on the inner surface of external dermal bones. Finally, on both sides of P 13837 there are four small foramina situated on the posterior face of the mandible near the junction between the postsplenial and splenial and the Meckelian bone. (On the left side there are apparently only three foramina on the external surface, but one large foramen apparently provides access for two canals.) In P 46773, a smaller specimen, there are only three foramina in this position on the right side. The same is probably true of the left side though it is too broken to be certain of this. Three of the foramina in P 13837 and two in P 46773 (Fig. 21, fx mi VII) lead forward through short canals onto grooves uniting on the internal surface of the postsplenial, approximately at its center, and then pass forward as a single groove opening via a large foramen (f2 mi VII) into the anterior furrow. The function of this system is not clear but the foramina are too small to have carried arteries or other vessels. They may well have carried one or more branches of the ramus mentalis internus VII and possibly such a nerve as the ramus alveolaris VII. The fourth foramen in P 13837 and the third in P 46773 (Fig. 21, fv?) is larger and is connected to a vertical canal that issues in a foramen. 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 Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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