. Bulletin of the British Museum (Natural History). 150 COCKS & RONG. 174 173c Figs 173, 174 Murjukiana ilovata Severgina, 1967, from Ilovatski Horizon ( Ordovician), Suresov, Kuznetz Alatau, Altai Mountains, USSR. Fig. 173, latex casts of interior and exterior and natural internal mould of interior of a brachial valve, the original of Severgina 1967: pi. 5, figs 12, 13, VSEGEI 430-1/1323, x 3; Fig. 174, natural internal mould of a pedicle valve, holotype, the original of Severgina 1967: pi. 5, fig. 11, VSEGEI 428/1323, X 4. Discussion. Only the exterior of a pedicle valve i
. Bulletin of the British Museum (Natural History). 150 COCKS & RONG. 174 173c Figs 173, 174 Murjukiana ilovata Severgina, 1967, from Ilovatski Horizon ( Ordovician), Suresov, Kuznetz Alatau, Altai Mountains, USSR. Fig. 173, latex casts of interior and exterior and natural internal mould of interior of a brachial valve, the original of Severgina 1967: pi. 5, figs 12, 13, VSEGEI 430-1/1323, x 3; Fig. 174, natural internal mould of a pedicle valve, holotype, the original of Severgina 1967: pi. 5, fig. 11, VSEGEI 428/1323, X 4. Discussion. Only the exterior of a pedicle valve is figured by Wang & Yan (1978: pi. 54, fig. 20) and no internals are known; the genus can be considered a nomen dubium. Species assigned Pseudoanisopeurella aletheta Xu, in Wang & Yen 1978: 222; pi. 54, fig. 20 from U. Miaopo Formation (L. Caradoc), Fenxiang, Yichang County, W. Hubei Province, China. Species assigned ' " " Ukoa ornata Opik, 1932: 33; pi. 4, figs 26-28; pi. 8, fig. 35 from Aseri Formation (Llanvirn), Tsitri, Estonia, USSR. GENERA REJECTED FROM THE PLECTAMBONITACEA UKOA Opik, 1932 1932 Ukoa Opik: 33 1965 Ukoa Williams: H372 Type species. Ukoa ornata Opik, 1932. Discussion. Although Williams (1965: H272) states the shell is impunctate, the close-up view of a part of the ornament and adjacent shell figured by Opik (1932: pi. 8, fig. 35) suggests to us that the type species possesses pseudopunctae and is properly classified within the Strophomenida. The type species is resupinate and weakly geniculate and may be related to Inversella and Ahtiella, but the interior is unknown and thus the genus cannot be accurately classified in this paper. The following genera have all been attributed to the Plectam- bonitacea by their original authors, but we do not consider them as forming part of the superfamily. £OC/?4Af/im Williams, 1974 1974 Eocramatia Williams: 128 Type species. Eocramatia dissimulata V^WWam?,, 1974. Discussion. The only known specimens of
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