. Bulletin of the British Museum (Natural History), Geology. 240 R. A. FORTEY & R. M. OWENS. Fig. 98 Neseuretus murchisoni (Salter 1865). Lower Arenig, Moridunian Stage, Ogof Hen Formation, Bolahaul Member, temporary exposures (1981) on Carmarthen bypass, south of Pensarn (a, e), temporary exposure at water treatment plant, Penddaulwyn Fawr, Capel-Dewi (Fortey & Owens 1978: loc. 12) (d) and tipped material at Wennallt, Allt Cystanog, Carmarthen (Fortey & Owens 1978: loc. 9) (b, c). a, undistorted cranidium, preserving original relief, x 3-5, NMW ; b, cranidium, latex cast
. Bulletin of the British Museum (Natural History), Geology. 240 R. A. FORTEY & R. M. OWENS. Fig. 98 Neseuretus murchisoni (Salter 1865). Lower Arenig, Moridunian Stage, Ogof Hen Formation, Bolahaul Member, temporary exposures (1981) on Carmarthen bypass, south of Pensarn (a, e), temporary exposure at water treatment plant, Penddaulwyn Fawr, Capel-Dewi (Fortey & Owens 1978: loc. 12) (d) and tipped material at Wennallt, Allt Cystanog, Carmarthen (Fortey & Owens 1978: loc. 9) (b, c). a, undistorted cranidium, preserving original relief, x 3-5, NMW ; b, cranidium, latex cast from external mould, x 4, NMW ; c, thorax and pygidium, latex cast from external mould, x 3-5, NMW ; d, cranidium showing large palpebral lobe, x 4-5, NMW ;e, thorax and pygidium, x 2, NMW the Carnedd Iago Formation, Henllan Ash Member, Arennig Fawr district (Whittington 1966: 503), and commonly in the lowest one-third of the Mytton Flags, Shelve inlier. Diagnosis. Cranidium like N. ramseyensis; pygidium with axis anteriorly about one-third anterior breadth (tr.), and extending to posterior margin, composed of five rings and a terminal piece; four pairs of pleural ribs. Remarks. This species has been fully described by Whittard (1960: 148), and well-preserved specimens from the Bolahaul Member are illustrated here for comparison. Neseuretus cf. complanatus Whittard 1960 (Figs 99a-d) Material. One incomplete cephalon and two incomplete pygidia from the Whitlandian, Afon Ffinnant Formation, loc. 19. Remarks. The cephalon resembles N. complanatus from the Mytton Flags in having a flat lateral profile (compare Fig. 99b with Whittard 1960: pi. 20, fig. 5), but we are uncertain whether this is at least in part produced by compression both in our specimen and in Whit- tard's. Otherwise it is closely comparable with that of N. parvifrons except that in the type of complanatus the palpebral lobe is apparently larger and in it and our specimen the g
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