. Bulletin of the British Museum (Natural History), Geology. ARENIG IN SOUTH WALES 227 Occurrence in south Wales. Llanfallteg Formation, type section at Llanfallteg Railway cutting from 20m below Arenig-Llanvirn boundary to highest beds in Llanvirn exposed; and at Rhyd-y-wrach farm and Scolton railway cutting. The species extends into the overlying black Llanvirn shales. Latest Arenig (Dionide levigena Biozone) to early Llanvirn. Figured material. It. 19698, GSM HT354. Additional material. NMW , , It. 19699. Discussion. This species has been fully discussed under A. linley
. Bulletin of the British Museum (Natural History), Geology. ARENIG IN SOUTH WALES 227 Occurrence in south Wales. Llanfallteg Formation, type section at Llanfallteg Railway cutting from 20m below Arenig-Llanvirn boundary to highest beds in Llanvirn exposed; and at Rhyd-y-wrach farm and Scolton railway cutting. The species extends into the overlying black Llanvirn shales. Latest Arenig (Dionide levigena Biozone) to early Llanvirn. Figured material. It. 19698, GSM HT354. Additional material. NMW , , It. 19699. Discussion. This species has been fully discussed under A. linleyoides sp. nov. above (pp. 224-5), which it resembles closely. Specimens from the Llanfallteg Formation have the charac- ters of linleyensis whether they are above or below the Arenig/Llanvirn boundary. Rushton & Hughes (1981) have described A. cf. linleyensis from the Great Paxton borehole. These speci- mens are more like linleyensis than like linleyoides, and they could well be accommodated within the range of variation of the former. We have mentioned above the possible occurrence of linleyensis in Fig. 88 Comparative reconstructions of axial shields of British Arenig raphiophorid species, a, Ampyx linleyoides sp. nov., Fennian, B. rushtoni Biozone; b, Cnemidopyge salteri Hicks, Whitlandian, G. gibbsii Biozone; c, pygidium of A. linleyensis Whittard, latest Fennian and early Llanvirn. All x 3 approx. See also Fig. 90. Genus CNEMIDOPYGE Whittard 1955 Type species. Trinucleus nudus Murchison 1839, by original designation. Diagnosis. The diagnosis of Hughes (1969) is followed here, except that we admit species with the pygidium smaller than the 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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