. Bulletin. Natural history. FIG. 24. Dermal bones of the mandible in Rhipidistia and Dipnoi. A) Holoptychius (Crossopterygii, Rhipidistia), after Jarvik and various sources. B) Dipnorhynchus sussmilchi, original. C) interpre- tation of Melanognathus given by Jarvik (1967), redrawn. D) new interpretation of Melanognathus. E) interpretation of Dipterus given by Jarvik (1967). Redrawn. F) new interpretation of Dipterus. G) Scaumenacia cura, redrawn from jarvik (1967), new interpretation. H) Neoceratodus, redrawn from Jarvik (1967), new interpretation. E, F, G, and H appear on p. 61. ward above t
. Bulletin. Natural history. FIG. 24. Dermal bones of the mandible in Rhipidistia and Dipnoi. A) Holoptychius (Crossopterygii, Rhipidistia), after Jarvik and various sources. B) Dipnorhynchus sussmilchi, original. C) interpre- tation of Melanognathus given by Jarvik (1967), redrawn. D) new interpretation of Melanognathus. E) interpretation of Dipterus given by Jarvik (1967). Redrawn. F) new interpretation of Dipterus. G) Scaumenacia cura, redrawn from jarvik (1967), new interpretation. H) Neoceratodus, redrawn from Jarvik (1967), new interpretation. E, F, G, and H appear on p. 61. ward above the splenial and postsplenial where it unites with its fellow and is supported by the median symphysial wall of Meckelian bones. This region is not well preserved on any specimen, and we find it almost impossible to reconstruct with accuracy. There does, however, seem to have been an anterior furrow in the curve of the dentary, and this must have been floored with thin Meckelian bone. Rostral tubuli may be present in the snout of 53377, but the evidence is not con- clusive. There are, however, large pores in the dentary similar to those that open into rostral tubuli in Dipnorhynchus. Apart from obvious differences in detention, the mandible of Dipterus differs from that of Dipnorhynchus in the following main features. The angular and sur-. 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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