. Bulletin of the British Museum (Natural History). 40 M. G. LOCKLEY & A. WILLIAMS specimens Pr. 652-3, the internal and external parts of an exfoliated Mcewanella brachial valve (Fig. 122), have been collected from 'Llandeilo' beds exposed at Clog-y-fran Farm, west of St Clears, Dyfed(SN 161238 approx.). These identifications testify to the widespread, though rare, occurrence oi Mcewanella in the Lower to Middle Ordovician rocks of Figs 112-122 Mcewanella berwynensis MacGregor. Fig. 112, BB 94069, internal mould of a brachial valve x 4; Fig. 113, BB 94072, internal mould of a pedi
. Bulletin of the British Museum (Natural History). 40 M. G. LOCKLEY & A. WILLIAMS specimens Pr. 652-3, the internal and external parts of an exfoliated Mcewanella brachial valve (Fig. 122), have been collected from 'Llandeilo' beds exposed at Clog-y-fran Farm, west of St Clears, Dyfed(SN 161238 approx.). These identifications testify to the widespread, though rare, occurrence oi Mcewanella in the Lower to Middle Ordovician rocks of Figs 112-122 Mcewanella berwynensis MacGregor. Fig. 112, BB 94069, internal mould of a brachial valve x 4; Fig. 113, BB 94072, internal mould of a pedicle valve x 4; Fig. 114, BB 94068, latex cast of the external mould of a pedicle valve x 5; Figs 115-116, BB 94070 and 92331 respectively, internal moulds of brachial valves both x 4; Fig. 117, BB 94067, partially exfoliated pedicle valve x 4; all from Llanvirn sandstones, Howey Brook, Llandrindod. Figs 118-119, BB 92279 and 94074 respectively, partially exfoliated brachial valves x4 and x2; Fig. 120, BB 94073, latex cast of external mould of a pedicle valve x2-5; all from Lower Llandeilo Limestones, Dynevor Park, Llandeilo. Fig. 121. GSM 1 1965. latex cast of external mould of a brachial valve x3, from Llandeilo Beds, Llan Mill, Lampeter Velfrey, Dyfed. Fig. 122, GSM partially exfoliated brachial valve x2, from Llandeilo Beds, Clog y fran, St Clears, Dyfed. Family SKENIDIIDAE Kozlowski, 1929 Genus SKENIDIOIDES Schuchert & Cooper, 1931 Skenidioides sp. (Fig. 123) Two small external moulds of transverse dorsal valves (BB 92332 and a smaller incomplete specimen) from the upper part of the Flags and Grits in the Ffairfach Group, Ffairfach, Llandeilo (SN 628211) are provisionally assigned to Skenidioides. The valves are planar to slightly convex and between half to two-thirds as long as wide with acute cardinal angles;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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