. Bulletin of the British Museum (Natural History). 124 COCKS & RONG. Fig. 94 Aegiria (Aegiria) aquila aquila (Barrande, 1848), from Zahorany Formation (M. Caradoc), Palmovka, Praha-Liben, Czechoslovakia; a, posterior view of cardinal process, x 25 and b, brachial valve interior, x 12 (based on BC 7212). few papillae whilst the larger specimen in fig. 24 shows a great number. In addition, some species show many papillae in all their specimens, whilst in other species papillae can be uncommon. Young & Gibbons (1983) also discuss the prob- lem and conclude that Chonetoidea and
. Bulletin of the British Museum (Natural History). 124 COCKS & RONG. Fig. 94 Aegiria (Aegiria) aquila aquila (Barrande, 1848), from Zahorany Formation (M. Caradoc), Palmovka, Praha-Liben, Czechoslovakia; a, posterior view of cardinal process, x 25 and b, brachial valve interior, x 12 (based on BC 7212). few papillae whilst the larger specimen in fig. 24 shows a great number. In addition, some species show many papillae in all their specimens, whilst in other species papillae can be uncommon. Young & Gibbons (1983) also discuss the prob- lem and conclude that Chonetoidea and Sericoidea should be regarded as synonyms. Only two specimens are known of Sentolunia senta (Havli'cck, 1967: 53), one pedicle valve and one brachial valve. In the brachial valve the bema is more obvious and continuous than in the specimens of Chonetoidea radiatula from the same formation and locaHty (Havh'cek 1967: pi. 5). We are not certain whether or not Sentolunia is correctly synonymized with Chonetoidea, but until more specimens become avail- able we think it most likely that these two specimens are at the extreme limit of the range of variation of Chonetoidea radiatula. Species assigned Sericoidea ahdita Williams, in Whittington & Williams 1955: 418; pi. 39, figs 83-85 from Derfel Limestone (L. Caradoc), Pont Abcrdcrfel, Gwynedd, Wales. Sericoidea abdita complicata Lockley, 1980: 212, figs 54-59 from Nod Glas Formation (U. Caradoc), Rhiw March, Llanymawddwy, Powys, Wales. Chonetoidea gamma Spjeldnaes, 1957: 106; pi. 2. figs 12-13 from Zone 4b (Caradoc-Ashgill), Blakstad, Asker, Norway. Sericoidea homolensis Havh'cek, 1967: 52; pi. 8, figs 1-5 from Bohdalec Formation (M. Caradoc), near Kacerov, Czechoslovakia. Chonetoidea iduna Opik 1933: 52; pi. 10, figs 6, 7; pi. 11, figs 1, 2 from Zone 4c (L. Ashgill), Frogno, Ringerike, Norway. Sericoidea miaopoensis Chang, 1983: 479; pi. 1, figs 7, 14, 15 from Miaopo Formation (U. Llandeilo-L. Caradoc), Huanghuachang, Yichang Cou
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