. Bulletin of the British Museum (Natural History), Geology. 38 THE HEAD OF DIPTERUS VALENCIENNESI The anterior angle of the parasphenoid in this specimen shows a very well marked hypophysial foramen () which runs inwards (upwards) and somewhat backwards. There is a broad, fiat or slightly concave selvage along the antero-lateral sides which is widest in front medially and decreases laterally to vanish at the greatest breadth. On the medial side of this selvage the parasphenoid shows a complementary depres- sion or groove, narrowest medially in front and widest behind at the lateral angle.
. Bulletin of the British Museum (Natural History), Geology. 38 THE HEAD OF DIPTERUS VALENCIENNESI The anterior angle of the parasphenoid in this specimen shows a very well marked hypophysial foramen () which runs inwards (upwards) and somewhat backwards. There is a broad, fiat or slightly concave selvage along the antero-lateral sides which is widest in front medially and decreases laterally to vanish at the greatest breadth. On the medial side of this selvage the parasphenoid shows a complementary depres- sion or groove, narrowest medially in front and widest behind at the lateral angle. Between these grooves the parasphenoid is gently convex. Near the front of this. '\yff--- .^ Figs. 48, 49. Dipterus valenciennesi S. & M. Fig. 48, Basioccipital region to show course, partly excavated, of occipital artery {). Clardon Haven, near Thurso, Caithness. X2-25. Fig. 49, Palatal view. See also PI. i, fig. i. Clardon Haven, near Thurso, Caithness. X2-25. Both specimens colld. D. L. Dineley, 1957. fd, fold ; , hypophysial foramen ; , secondary denticles. Other lettering as in Figs. 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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