. Bulletin of the British Museum (Natural History), Geology. R. A. FORTEY & R. M. OWENS. Fig. 103 Ormathops llanvirnensis (Hicks 1875). Llanfallteg Formation, uppermost Arenig, Fennian Stage, D. levigena Biozone (b, f) or basal Llanvirn, D. artus Biozone (others), a, well-preserved cephalon showing sculpture, latex cast from external mould, Whitland, x 3-5, NMW 15; b, cephalon preserving original relief, and showing course of suture in front of glabella, loc. 52P, x 4, It. 19002; c, incomplete cephalon, Cefn-farchen (Geological Survey loc. Pern. 24SE E/15), x 3, BGS Pr2031; d, in
. Bulletin of the British Museum (Natural History), Geology. R. A. FORTEY & R. M. OWENS. Fig. 103 Ormathops llanvirnensis (Hicks 1875). Llanfallteg Formation, uppermost Arenig, Fennian Stage, D. levigena Biozone (b, f) or basal Llanvirn, D. artus Biozone (others), a, well-preserved cephalon showing sculpture, latex cast from external mould, Whitland, x 3-5, NMW 15; b, cephalon preserving original relief, and showing course of suture in front of glabella, loc. 52P, x 4, It. 19002; c, incomplete cephalon, Cefn-farchen (Geological Survey loc. Pern. 24SE E/15), x 3, BGS Pr2031; d, incomplete cephalon, locality as Fig. 103c, latex cast from external mould showing eye, x 3, and g, detail of eye of same specimen showing lenses, x 8, BGS Pr2030; e, thorax and pygidium, Castell-gorfod mill, north of St Clears, x 1-5, NMW ; f, moult arrangement of displaced cephalon, thorax and pygidium, loc. 52T, Llanfallteg, x 3, single small cephalon from the Hope Shales, seems to be distinct from both 0. llanvirnensis and O. nicholsoni; from the latter it can be distinguished in lacking a palpebral furrow and in having a straight 3P furrow, and from the former in having a deep, straight 3P furrow. It cannot be excluded, however, that 0. alata may be simply an immature 0. llanvirnensis; we lack compara- tive material of a similar size. Family ODONTOPLEURIDAE Burmeister 1843 Genus SELENOPELTIS Hawle & Corda 1847 Type species. Odontopleura buchii Barrande 1846, by monotypy. Diagnosis. See Bruton, in Bruton & Henry (1978: 894).. 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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