. Bulletin of the British Museum (Natural History). 100 COCKS & RONG. Fig. 45 Bimuria superba Ulrich & Cooper, 1942, from Arline Formation (Llandeilo), half mile east of Friendsville, Tennessee, USA, posterior and anterior views of the cardinal process area, based on BC 7269, x 6. Petroria rugosa Wilson, 1926: 27; pi. 5, figs 15-18 from Orthidiella Zone, Skoki Formation ( Arenig), Palliser Pass, British Columbia, Canada (revised Cooper 1956: pi. 221, figs 29-36). Petroria cf. P. austrina of Ross & James 1987: 85; pi. 4, figs 1-5 from Shallow Bay Formation (U. Arenig)
. Bulletin of the British Museum (Natural History). 100 COCKS & RONG. Fig. 45 Bimuria superba Ulrich & Cooper, 1942, from Arline Formation (Llandeilo), half mile east of Friendsville, Tennessee, USA, posterior and anterior views of the cardinal process area, based on BC 7269, x 6. Petroria rugosa Wilson, 1926: 27; pi. 5, figs 15-18 from Orthidiella Zone, Skoki Formation ( Arenig), Palliser Pass, British Columbia, Canada (revised Cooper 1956: pi. 221, figs 29-36). Petroria cf. P. austrina of Ross & James 1987: 85; pi. 4, figs 1-5 from Shallow Bay Formation (U. Arenig), Cow Head, Newfoundland, Canada. Species tentatively assigned Petroria ? austrina Ross, 1972: 27; pi. 11, figs 1-5 from bioherm of Arenig age, Meiklejohn Peak, Nevada, USA (no interiors known). Species rejected Petroria lata Xu & Liu, 1984: 203; pi. 13, figs 19-26 from Dawan Formation ( Arenig), Yichang, Hubei Province, China (no platform in brachial valve, undercut cardinal process; genus uncertain but probably subfamily Chonetoideinae). Family BIMURIIDAE Cooper, 1956 1956 Bimuriidae Cooper: 764 (pars) 1965 Bimuriidae Williams: H383 (pars) Diagnosis. Cardinal process simple, not undercut. With bema. With side septa. Remarks. Cooper (1956) and Williams (1965) united the two genera Bimuria and Craspedelia as the sole genera within the Bimuriidae chiefly on account of their smooth surface and side septa. However, we divide these two genera into separ- ate families on the fundamental basis of their cardinal pro- cess. True Bimuria has a simple cardinal process, whilst that of Craspedelia (and some species formerly attributed to Bimuria, but attributed to the new genus Cooperea here) is undercut and thus assigned to the Sowerbyellidae. Genus assigned. Bimuria Ulrich & Cooper, 1942. Range. Llandeilo {B. superba) to U. Caradoc {B. youngiana). BIMURIA Ulrich & Cooper, 1942 Figs 45^7 â 1942 Bimuria Ulrich & Cooper: 622 1956 Bimuria Cooper: 764 pars . ' 1965 S/mun
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