. Bulletin of the British Museum (Natural History). 9 10 11 Figs 6-11 Ingria cloudi (Ulrich & Cooper, 1936), topotypes, all silicified specimens from the Orthidiella Zone (L. Llanvirn), first ridge east of Frenchman's Flat, Nevada, USA. Fig. 6, pedicle valve interior BC 10312; Fig. 7, brachial valve exterior BC 10309; Fig. 8, brachial valve interior BC 10306; Fig. 9, brachial valve interior BC 10307; Fig. 10, exterior view of two conjoined valves BC 10313; Fig. 11, pedicle valve interior BC 10310. All x 3. Ingria flabellum Opik, 1932: 22; pi. 10, fig. 42 from Lower Llanvirn beds,
. Bulletin of the British Museum (Natural History). 9 10 11 Figs 6-11 Ingria cloudi (Ulrich & Cooper, 1936), topotypes, all silicified specimens from the Orthidiella Zone (L. Llanvirn), first ridge east of Frenchman's Flat, Nevada, USA. Fig. 6, pedicle valve interior BC 10312; Fig. 7, brachial valve exterior BC 10309; Fig. 8, brachial valve interior BC 10306; Fig. 9, brachial valve interior BC 10307; Fig. 10, exterior view of two conjoined valves BC 10313; Fig. 11, pedicle valve interior BC 10310. All x 3. Ingria flabellum Opik, 1932: 22; pi. 10, fig. 42 from Lower Llanvirn beds, Wassilkowo, USSR. Ingria holtedahli Opik, 1939: 128; pi. 4, figs 3, 5-9 from Expansus Shale (L. Llanvirn), Krekling, Norway. Ingria malinovensis Andreeva, 1985: 40; pi. 4, figs 20-23 from Tarlikskaya Formation (Middle Ordovician), River Uyuk, Tuva, USSR. Orthisina nefedyevi Eichwald, 1855: pi. 36, fig. 13 from Expansus Beds, now Kunda Formation (L. Llanvirn), Iswos am Wolchow, Estonia, USSR (revised Opik 1932: 17; pi. 6, fig. 32; pi. 7, fig. 34; pi. 10, figs 41, 43, 44). Ingria occidentalis Opik, 1939: 129; pi. 3, fig. 12; pi. 5 figs 3-4 from Expansus Shale (L. Llanvirn), Hedenstad, Norway. Ingria pakriana Opik, 1932: 23; pi. 1, figs 1^; pi. 2 figs 7-9; pi. 6, fig. 33 from the Rogo Sandstones (L. Llanvirn), Paldiski, Estonia, USSR. Ingria sp. of Neuman 1977: 29; pi. 6, figs 19-23, 26-28, ?figs 24, 25, 29 from Arenig-Llanvirn of New World Island, Newfoundland, Canada. Ingria sp. A of Opik 1932: 21; pi. 1, fig. 5 from Rogo Sandstone (L. Llanvirn), Halbinsel Paldiski, Estonia, USSR. Ingria sp. B of Opik 1932: 29; pi. 1, fig. 6 from Rogo Sandstone (L. Llanvirn), Little Rogo Island, Estonia, USSR. Ingria sp. C of Opik 1932: 31; pi. 2, fig. 13 from Megalaspid Limestone (U. Arenig), Little Rogo Island, Estonia, USSR. Species questionably assigned Ingria sp. Opik, 1939: 129 (Ingria ? sp. in pi. 4, fig. 4) from Expansus shale (L. Llanvirn). Krekling, Norway (only a single brachial valv
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