. Bulletin of the British Museum (Natural History), Geology. 238 TWO UPPER CRETACEOUS SALMONIFORM The pterosphenoids (Pts, Fig. 20) are separated by the optic fenestra and there is a large orbitosphenoid (Ors, Fig. 20), closing the fenestra anteriorly, which differs from the orbitosphenoid of Gaudryella in lacking a ventral process in front of the fenestra. The sclerotic is ossified (scr, Fig. 19), probably in four pieces. (iii) Circumorbital bones. There are eight circumorbital bones ; dermosphenotic, four infraorbitals, lachrymal, antorbital and supraorbital (Fig. 31). As in Gaudryella there
. Bulletin of the British Museum (Natural History), Geology. 238 TWO UPPER CRETACEOUS SALMONIFORM The pterosphenoids (Pts, Fig. 20) are separated by the optic fenestra and there is a large orbitosphenoid (Ors, Fig. 20), closing the fenestra anteriorly, which differs from the orbitosphenoid of Gaudryella in lacking a ventral process in front of the fenestra. The sclerotic is ossified (scr, Fig. 19), probably in four pieces. (iii) Circumorbital bones. There are eight circumorbital bones ; dermosphenotic, four infraorbitals, lachrymal, antorbital and supraorbital (Fig. 31). As in Gaudryella there is no sign of any association between the infraorbital sensory canal and the antorbital or supraorbital. Fig. 19. Humbertia operta gen. & sp. nov. Skull as preserved in AM 4411, Hajula, Lebanon. The ventral part of the preopercular, the supramaxillae and the lachrymal and second infraorbital are damaged in this specimen. The suffixes ' r ' and ' 1 ' denote bones of the right and left side, explanation of other abbreviations p. 296. The supraorbital (So, Figs. 15, 19) is longer and broader than that of Gaudryella but is otherwise similar. Posteriorly the supraorbital ends close to the tip of the dermosphenotic so that the circumorbital ring of bones is almost complete. The comma-shaped antorbital (Ao, Figs. 15, 19) is very like that of Gaudryella but is a little deeper posteriorly. As -in Gaudryella, the infraorbitals are flimsy bones and are never well preserved. The lachrymal (Lac, Figs. 15A, 19-21) is similar in shape to that of Gaudryella but is a little deeper, and has only two ventral branches of the sensory canal which are. 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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