. Bulletin of the British Museum (Natural History), Geology. 396 BUCHANOSTEID ARTHRODIRES (, PL 6, figs 1-4), and also the left side of this bone from a smaller animal (P. 33629). The former was identified by Dr. Roger Miles who has described it more fully in relation to other material (Miles 1971 : 185, text-figs 104,105, 'Buchanosteus'). It is complete on the right side but has lost its roof on the left, and the component bones, pineal, rostral, post-nasal and pre-rostral, if present, are completely fused together. The triangular subnasal shelf or lamina {sns) fits closely on the ethm
. Bulletin of the British Museum (Natural History), Geology. 396 BUCHANOSTEID ARTHRODIRES (, PL 6, figs 1-4), and also the left side of this bone from a smaller animal (P. 33629). The former was identified by Dr. Roger Miles who has described it more fully in relation to other material (Miles 1971 : 185, text-figs 104,105, 'Buchanosteus'). It is complete on the right side but has lost its roof on the left, and the component bones, pineal, rostral, post-nasal and pre-rostral, if present, are completely fused together. The triangular subnasal shelf or lamina {sns) fits closely on the ethmoid shield immediately below the anterior fenestra of the neuro-cranial cavity [afcv, Text- figs. 8-10), on each side of which is a well-marked groove for the optic nerve [). The posterior face of the postnasal wall is hollowed out to form a deep transverse groove or cavity for the telencephalon {) with the cribrosal area on each side {fno, PI. 6, figs 2, 4) for the passage of the olfactory nerve fila, and above there appears to be the much damaged pineal opening {pi). The olfactory tract must have been very short {cf. Stensio 1963, text-fig. 38A). Laterally to the cribrosal. 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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