. Bulletin of the British Museum (Natural History), Geology. CARADOCIAN BKACHIOPOD FAUNAS OF THE BALA DISTRICT 353 field elongately oval in outline extending anterior of umbo for about two-fifths the length of valve, submedian lobes not enclosing lanceolate adductor impressions anteriorly ; ventral pallial sinus pattern saccate, vascula media closely adjacent posteriorly splayed and divided anteriorly ; cardinal process ridge-like and erect, flanked by chilidial plates, brachiophores short, widely splayed and together with notothyrial platform commonly heavily encased in secondary shell and un
. Bulletin of the British Museum (Natural History), Geology. CARADOCIAN BKACHIOPOD FAUNAS OF THE BALA DISTRICT 353 field elongately oval in outline extending anterior of umbo for about two-fifths the length of valve, submedian lobes not enclosing lanceolate adductor impressions anteriorly ; ventral pallial sinus pattern saccate, vascula media closely adjacent posteriorly splayed and divided anteriorly ; cardinal process ridge-like and erect, flanked by chilidial plates, brachiophores short, widely splayed and together with notothyrial platform commonly heavily encased in secondary shell and united to short median ridge, dorsal adductor field small, obscured by proximal ends of vascula myaria and media, pallial sinus pattern saccate modified to (o) (b) Fig. 6. The dorsal (a) and ventral (b) interiors of Nicolella actoniae (J. de C. Sowerby), x 2-5 approx., showing the pallial sinus patterns : g, impression of gonocoele ; gg, vascula genitalia ; m, vascula media ; y, vascula myaria. length width (mm Lectotype. Internal mould of pedicle valve Other material. ( Geol. Soc. Coll. 6883) Internal mould of pedicle valve 19-0 23-0 () External mould of brachial valve 17-8 29-5 () Internal mould of brachial valve 18-3 24-8 () Internal mould of brachial valve — — () 16-0 21-0 Horizon and localities. Actonian Stage : the lectotype, 6883 and from buff-weathering sandstones, "Acton Scott", Shropshire; and 27317 from buff-weathering sandstones exposed in a stream section by the east side of a road-bridge about 1,000 ft. west-south-west of Hatton, Shropshire ; from loose blocks near Acton Scott Church, possibly from the quarry of Castle Hill, one-third of a mile west-south-west of Acton 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 resembl
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