. Bulletin of the British Museum (Natural History), Geology. 40 THE HEAD OF DIPTERUS VALENCIENNESI although some show parts of the supporting bone, but one seems to show remains of the dentition that can be reasonably interpreted (33166, PI. 2, fig. 4). Watson & Day (1916 : 33, text-fig. 6) and others following them showed a pair of elongated plates with three transverse rows of small denticles and a narrow hinder end inserted medially between the front of the entopterygoid tooth-plates. None of the available specimens shows evidence to support this arrangement, which may be based on the u
. Bulletin of the British Museum (Natural History), Geology. 40 THE HEAD OF DIPTERUS VALENCIENNESI although some show parts of the supporting bone, but one seems to show remains of the dentition that can be reasonably interpreted (33166, PI. 2, fig. 4). Watson & Day (1916 : 33, text-fig. 6) and others following them showed a pair of elongated plates with three transverse rows of small denticles and a narrow hinder end inserted medially between the front of the entopterygoid tooth-plates. None of the available specimens shows evidence to support this arrangement, which may be based on the uneven resorption of the surface of the entopterygoid tooth-plates, as this tends to start along the mid-line and in front (, , 33166, PI. 2, figs. 2-4) and the narrow extension of these plates is usually broken away. The last of these specimens shows a very different arrangement : on each vomer there are two or perhaps three. Fig. 50. Dipteriis valenciennesi S. & M. Restoration of Skull, palatal 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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