. Bulletin of the British Museum (Natural History), Geology. FISHES FROM THE LEBANON 239 broader, end closer to the ventral edge of the bone than the three in Gaiidryella, and are more frequently bifurcated. As in Gaudryella, the second infraorbital (I02, Figs. 19, 21) is slender and about equal to the lachrymal in length. The sensory canal ran near the centre of the bone in a deep groove which is covered over to form a tube for a short distance in the posterior half of the bone. Behind the eye, where there are only two infraorbitals in Gaudryella, there are three in Humbertia, as in most prim
. Bulletin of the British Museum (Natural History), Geology. FISHES FROM THE LEBANON 239 broader, end closer to the ventral edge of the bone than the three in Gaiidryella, and are more frequently bifurcated. As in Gaudryella, the second infraorbital (I02, Figs. 19, 21) is slender and about equal to the lachrymal in length. The sensory canal ran near the centre of the bone in a deep groove which is covered over to form a tube for a short distance in the posterior half of the bone. Behind the eye, where there are only two infraorbitals in Gaudryella, there are three in Humbertia, as in most primitive teleosts. The third infraorbital (I03, Figs. 19, 20) resembles that of. Brr5-7 Fig. 20. Humbertia operta gen. & sp. nov. Skull crushed in ventro-lateral aspect, as preserved in , Hajula, Lebanon. The suffixes ' r ' and ' 1 ' denote bones of the right and left side, explanation of other abbreviations p. 296. Gaudryella in shape, but the sensory canal runs in a channel which is open ventrally, not in a closed tube, and there is no branch in the centre of the bone. The fourth and fifth infraorbitals (I04, I05, Figs. 19-21) together appear to be homologous with the fourth of Gaudryella. They extend back almost to the preopercular, but are less broad than the single bone in Gaudryella. In the fourth infraorbital, as in the third, the sensory canal ran in a channel which is open ventrally ; in the fifth the canal ran in a 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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