. Bulletin of the British Museum (Natural History), Geology. . Fig. 91 Seleneceme acuticaudata (Hicks 1875). Uppermost Arenig, Fennian Stage, D. levigena Biozone, loc. 52a, Llanfallteg, cranidium and partial thorax, x 3, Fig. 92 Placoparina sp. Latex cast from external mould, basal Llanvirn, loc. 52, Llanfallteg, x 7, Discussion. This species has been fully described by Whittard (1960), and the present material adds nothing to his description; it is figured as a matter of record. The first occurrence of the species is below the Arenig/Llanvirn boundary and hence earlier
. Bulletin of the British Museum (Natural History), Geology. . Fig. 91 Seleneceme acuticaudata (Hicks 1875). Uppermost Arenig, Fennian Stage, D. levigena Biozone, loc. 52a, Llanfallteg, cranidium and partial thorax, x 3, Fig. 92 Placoparina sp. Latex cast from external mould, basal Llanvirn, loc. 52, Llanfallteg, x 7, Discussion. This species has been fully described by Whittard (1960), and the present material adds nothing to his description; it is figured as a matter of record. The first occurrence of the species is below the Arenig/Llanvirn boundary and hence earlier than in Shropshire. The glabellar tubercle is very subdued on our material, but we regard this as a matter of preser- vation only. Family CHEIRURIDAE Hawle & Corda 1847 Subfamily ECCOPTOCHILINAE Lane 1971 Genus PLACOPARINA Whittard 1940 Type species. Cryphaeus Sedwickii M'Coy 1849, from presumed Llandeilo; Builth Wells district, Powys. By original designation. Placoparina sp. (Fig. 92) Material. A small, complete internal mould with counterpart external mould, NMW , b, from the basal Llanvirn, Llanfallteg Formation; loc. 52, Llanfallteg. A larger, badly preserved 'ghosted' complete specimen, NMW , from same horizon, loc. 52V. Remarks. The smaller, better preserved specimen is disarticulated behind the cephalon, the second and the seventh thoracic segments; the eighth thoracic segment is attached to the pygidium, and we interpret the specimen as a degree 7 meraspis. Although not well preserved, its general morphology is consistent with that of Placoparina (compare Whittard 1958: pi. 15, figs 6, 9). The larger specimen is less informative, but appears to possess the characteristic pleural spines on the pygidium. The specimens are not well enough preserved to tell whether they belong to P. sedgwicki (M'Coy). Family PLIOMERIDAE Raymond 1913 Subfamily PLACOPARIINAE Hupe 1953 Genus PLACOPARIA Hawle & Corda 1847 Type species. Trilobites zippei Boeck 1828, f
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