. Bulletin of the British Museum (Natural History), Geology. m:\ t~\ 1g. 11 Myofossa omaliana (de Koninck). Lower Carboniferous, Kildare, Ireland; BM 26327; Fig. 11a, top view; Fig. lib, anterior view; Fig. lie, view of right side; Fig. lid, view of left side. All xl. Posterior behind nymph. bones Anterior fig. 12 Myofossa costellata (M'Coy). Lower Limestone Shale, Lower Carboniferous, Gurdy railway cutting, Gurdy, near Beith, Ayrshire, Scotland; BM L47489; Fig. 12a, top view; Fig. 12b, anterior view; Fig. 12c, view of right side; all xl-25. Fig. 12d, BM L46425, transverse sections through lig
. Bulletin of the British Museum (Natural History), Geology. m:\ t~\ 1g. 11 Myofossa omaliana (de Koninck). Lower Carboniferous, Kildare, Ireland; BM 26327; Fig. 11a, top view; Fig. lib, anterior view; Fig. lie, view of right side; Fig. lid, view of left side. All xl. Posterior behind nymph. bones Anterior fig. 12 Myofossa costellata (M'Coy). Lower Limestone Shale, Lower Carboniferous, Gurdy railway cutting, Gurdy, near Beith, Ayrshire, Scotland; BM L47489; Fig. 12a, top view; Fig. 12b, anterior view; Fig. 12c, view of right side; all xl-25. Fig. 12d, BM L46425, transverse sections through ligament nymph, with detached nymph of right valve re-orientated to original position; approx. Xl3; see also Fig. 1. 71976 Myonia (Myonia) gorskyi Astafieva-Urbaitis: 32; pi. 3, fig. 5. ;f. 1984 Ragozinia gorskyi (Astafieva-Urbaitis); Muromzeva: 113-14; pi. 41, figs 6-8. 71984 Ragozinia dembskajae Muromzeva & Guskov, in Muromzeva: 114; pi. 41. figs 2, 4, 5. -lOLOTYPE. SM A4971, from the 'Goniatite Bed', Parinas 3uebrada, Peru, Permian (not Upper Carboniferous as in- erpreted by Thomas); Barrington-Brown collection. The ype material of this species was apparently mistakenly issociated with Pennsylvanian ammonoids when collected. Dther material. BM L9448, Irwin District, Perth Basin, Western Australia, no horizon recorded, but almost certainly Fossil Cliff Formation, Late Sakmarian; University of Western Australia, type no. 45374 (Dickins 1963: pi. 8, figs 12-13), from the Fossil Cliff Formation, Fossil Cliff, Perth Basin; Commonwealth Palaeontological Collection () No. 3881, from the Callytharra Formation, Carnarvon Basin; No. 3882, from the Nura Nura Member of the Canning Basin. These are all thought to be of Lower Permian, Late Sakmarian age. Dimensions. BM L9498: length 84mm, height 48mm, width (two valves) 35mm, gape c. 9mm. Discussion. During reorganization of the collections at the British Museum (Natural History) BM L9498 was found with Mesozoic specimens. I
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