. Bulletin. Natural history; Natuurlijke historie. A PRIMITIVE DEVONIAN LUNGFISH 55 f f2 ea I f4sal ffssal gr mV+VII ff mdV f meVII f3sa I. f intV Fig. 22. Dipnorhynchus sussmilchi. Attempted reconstruction of the canals, foramina, and grooves for the nervous and vascular systems of the lower jaw. on the posterior wall of the Meckelian vacuity. This then continues as a groove passing laterally and vertically till the bone begins to arch over to cover the under- surface of the prearticular dental surface. Here it branches. The posterodorsal branch runs back below the previously mentioned groove
. Bulletin. Natural history; Natuurlijke historie. A PRIMITIVE DEVONIAN LUNGFISH 55 f f2 ea I f4sal ffssal gr mV+VII ff mdV f meVII f3sa I. f intV Fig. 22. Dipnorhynchus sussmilchi. Attempted reconstruction of the canals, foramina, and grooves for the nervous and vascular systems of the lower jaw. on the posterior wall of the Meckelian vacuity. This then continues as a groove passing laterally and vertically till the bone begins to arch over to cover the under- surface of the prearticular dental surface. Here it branches. The posterodorsal branch runs back below the previously mentioned groove for the superior branch from the first efferent artery and sends off several short shallow grooves that enter foramina. The anterodorsal branch, which is stronger, crosses the groove for the artery and fifth nerve and then swings anteriorly to run adjacent to the main branch of the same. They enter the bone together (Fig. 21, /4 sa I). From here, as mentioned previously, canals are distributed to the posterior ends of the labial pit and the anterior furrow. This system may have held vascular elements. We have said nothing of the venous system, but judging from Fox (1965) there is no reason why the lateral venous sinus should not enter the jaw through the Meckelian vacuity and a branch may pass out posteriorly through the chamber (ch) and the dorsal notch in the foramen f int 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 : The Museum
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