. Bulletin of the British Museum (Natural History), Geology. CERTAIN TRIASSIC AND LIASSIC PHOLI DOPHORI D AE 383 Dermal bones of cheek and opercular apparatus Only the posteriorly directed part of the comparatively long maxillary {Mx, PI. 6, fig. 2 ; Text-fig. 6) is preserved ; apart from its relatively greater length it seems to have the same general shape as in Ph. bechei and Ph. latiusculus, but its ventral margin is defective and consequently nothing can be said about its real depth or about the dentition. Neither can it be determined with any accuracy whether its posterior margin is round
. Bulletin of the British Museum (Natural History), Geology. CERTAIN TRIASSIC AND LIASSIC PHOLI DOPHORI D AE 383 Dermal bones of cheek and opercular apparatus Only the posteriorly directed part of the comparatively long maxillary {Mx, PI. 6, fig. 2 ; Text-fig. 6) is preserved ; apart from its relatively greater length it seems to have the same general shape as in Ph. bechei and Ph. latiusculus, but its ventral margin is defective and consequently nothing can be said about its real depth or about the dentition. Neither can it be determined with any accuracy whether its posterior margin is rounded or slightly notched ; judging from an impression on the preoperculum behind the broken end of the maxillary it looks, however, as if its posterior margin was slightly notched. The lateral surface of the maxillary is richly ornamented with ganoin spots and irregular longitudinal streaks and ridges except along its postero-dorsal margin, indicating that supramaxillary 2 may overlap the maxillary a little. Of the supramaxillaries, supramaxillary i {Smx-^, PL 6, fig. 2 ; Text-fig. 6) is almost semicircular ; it is well separated from the maxillary, but seems not to overlap the dorsal margin of that bone ; its lateral surface carries a striation approximately parallel to the convex dorsal margin of the bone, similar to the striation on the dorsal. Fig. 6. Pholidophorns cf. pusillus Agassiz. Attempted restoration of head in lateral view. No. X 10. Ang, angular ; De. Spl, dentary ; //oi, //03, //04, infraorbitals i and 3-4 ; lop, interoperculum ; Mx, maxillary ; Op, operculum ; Pop, preoperculum ; Sbo, suborbital ; Smx^, Smx^, anterior and posterior supramaxillaries ; Sop, suboperculum ; poc, preopercular sensory canal. GEGL. II, 8 34. 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 (
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