Figure 5. Paleorhinus angustifrons (Kuhn, 1936), BSPG 1931 X 502. Close-up photographs of holotype skull. A, external nares in dorsal view (anterior of specimen to right). B, lateral margin of left external naris in lateral view (anterior of specimen to left). C, left antorbital fenestra in lateral view. D, main body of right jugal in lateral view, showing nodular row ventral to the orbit. E, nasofrontal region of skull roof in dorsal view. F, right lateral part of dorsal skull roof in dorsal view. Abbreviations: afen, antorbital fenestra; afos, antorbital fossa; alvr, alveolar ridge; asc, ascending process of maxilla; convx, convexities along lateral rim of the external naris; en, external naris; fdp, depression on anterior end of frontal; fl, laterally flared posterolateral margin of external naris; fr, frontal; gr, groove; itf, infratemporal fenestra; jg, jugal; jgb, series of bosses on lateral surface of jugal; jmri, ridge on jugal and maxilla; lc, lacrimal; lpw, lateral parietal wing; max, maxilla; na, nasal; na-fr, nasal–frontal suture; na-prf, nasal-prefrontal suture; ndp, depression on anterior end of nasal; orb, orbit; pa, parietal; pmp, posteromedial process of the premaxilla; po, postorbital; pof, postfrontal; prf, prefrontal; prod, pre-orbital depression; rec, reconstructed skull surface; sm?, probable position of septomaxilla; sq, squamosal; sqd, depression on dorsal surface of the squamosal; stf, supratemporal fenestra; thor, thickened orbital rim; tp.pmp, tip of the posteromedial process of the premaxilla.