. Bulletin of the British Museum (Natural History). . Fig. 118 Kassinella (Kassinella) sp. showing variation in the brachial valve interior from a population in the Changwu Formation (M. Ashgill), Jiangshan County, SW Zhejiang Province, China: a, after NIGP 101835, x 12; b, after NIGP 101836, x 12. Chonetoidea simorini [Borissiak MS] Sokolskaya, 1960: pi. 27, figs 24, 25 from Middle Ordovician, N. Kazakhstan, USSR. Anoptambonites sp. of Sheehan 1973: 62; pi. 2, figs 1, 2 from Jerrestad Mudstone (L. Ashgill), Fagelsang, Scania, Sweden. Species questionably assigned Kassinella tschingh
. Bulletin of the British Museum (Natural History). . Fig. 118 Kassinella (Kassinella) sp. showing variation in the brachial valve interior from a population in the Changwu Formation (M. Ashgill), Jiangshan County, SW Zhejiang Province, China: a, after NIGP 101835, x 12; b, after NIGP 101836, x 12. Chonetoidea simorini [Borissiak MS] Sokolskaya, 1960: pi. 27, figs 24, 25 from Middle Ordovician, N. Kazakhstan, USSR. Anoptambonites sp. of Sheehan 1973: 62; pi. 2, figs 1, 2 from Jerrestad Mudstone (L. Ashgill), Fagelsang, Scania, Sweden. Species questionably assigned Kassinella tschinghisensis Klenina, 1984: 87; pi. 8, figs 1-6 from Taldiboiskaya Formation, Bed tbjv (Ashgill), River Taldiboi, Chinghiz Mountains, Kazakhstan, USSR (no interiors figured). KASSINELLA (TRIMURELLINA) MitcheW, 1977 Figs 120-123 1977 TrimurellinaMitche\\:74 Type species. Trimurellina superba Mitchell, 1977. Diagnosis. Like Kassinella (Kassinella) but with brachial valve median septum extending anteriorly of the platform. Remarks. As stated in the remarks on Kassinella (Kassinella), the sub-peripheral rim is variably developed, but it is usually present in K. (Trimurellina) (except for the two specimens illustrated in Mitchell 1977: pi. 14, figs 3, 4). The brachial valve median septum is also variable in length, but only in K. (Trimurellina) does it regularly extend anteriorly beyond the platform, which is the basis for retaining a separate subgenus. Species assigned Trimurellina superba Mitchell, 1977: 74; pi. 14, figs 1-16 from Killey Bridge Formation ( Ashgill), Killey Bridge, Pomeroy, Northern Ireland. Species questionably assigned Trimurellina sp. of Williams & Wright 1981: 12, fig 4A from Wenallt Formation (Upper Ashgill), Wenallt, Garth, Powys, Wales. Family SOWERBYELLmAE Opik, 1930 1930 Sowerbyellinae Opik: 60 1938 Sowerbyellinae Ulrich & Cooper: 186 1953 Sowerbyellinae Williams: 8 1956 Sowerbyellidae Cooper: 774 1965 Sowerbyellidae Williams: H378 pars 1967 Sowerb
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