. Bulletin of the British Museum (Natural History). LOWER ORDOVICIAN BRACHIOPODA. Figs 179-181 Kullervo sp. Figs 179a, b, BB 92380, external and internal moulds of a pedicle valve, both x 6; Fig. 180, BB 92381, internal mould of a pedicle valve x 6; Fig. 181, BB 92400, latex cast of external mould of a pedicle valve x 6; all from the Flags and Grits, Ffairfach Group, type section. Figs 182-185 Triplesia edgelliana (Davidson). Fig. 182, BB 92386, exterior of a pedicle valve x4; Fig. 183, BB 92385, internal mould of a pedicle valve x 5; Fig. 184, BB 92399, internal mould ofa juvenile pedicle val
. Bulletin of the British Museum (Natural History). LOWER ORDOVICIAN BRACHIOPODA. Figs 179-181 Kullervo sp. Figs 179a, b, BB 92380, external and internal moulds of a pedicle valve, both x 6; Fig. 180, BB 92381, internal mould of a pedicle valve x 6; Fig. 181, BB 92400, latex cast of external mould of a pedicle valve x 6; all from the Flags and Grits, Ffairfach Group, type section. Figs 182-185 Triplesia edgelliana (Davidson). Fig. 182, BB 92386, exterior of a pedicle valve x4; Fig. 183, BB 92385, internal mould of a pedicle valve x 5; Fig. 184, BB 92399, internal mould ofa juvenile pedicle valve x 12; Fig. 185, BB 92395, internal mould of a pedicle valve x 4; all from Flags and Grits, Ffairfach Group, type section. See also Figs 186-191. SuborderTRIPLESIIDINA Moore, 1952 Superfamily TRIPLECIACEA Schuchert, 1913 Family TRIPLECIIDAE Schuchert, 1913 Genus TRIPLESIA Hall, 1859 Tnplesia edgelliana (Davidson) (Figs 182-191) 1869 Rhynchonella ? Edgelliana Davidson : 190; pi. 24, figs 27,28. 1978 Camerella edgelliana (Davidson) Cocks : 137. Diagnosis. Globular, equally biconvex, plicate Triplesia with pedicle and brachial valves respectively 91% and 88% as long as wide and 27% and 29% as deep as long. Description. Globular, biconvex, plicate Triplesia with well-rounded obtuse cardinal angles; adult pedicle^valve about 90% as long as wide and about 27% as deep as long (Tmm (var 1) 5-38 (1-45), th (var th) 1-45 (0-477), r 0-761 in 8 valves); ventral umbo slightly acute with short curved apsacline interarea with pseudodeltidium; broad, gently rounded ventral sulcus originating at about the 4 mm growth stage, with boundaries diverging at about 15° so that anteriorly sulcus and corresponding dorsal fold are about one-third as wide as valve in average-sized specimens; brachial valve about 88% as wide as long (1 mm (var I) 5-26 (6-529), w mm (var w) 5-97 (9-127), r 0-977 in 21 valves) and about 33% as deep as long (1 mm (var I) 487 (5-569), TH (var th) 1-60 (1-120), r 9-27 in 16
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