. Bulletin of the British Museum (Natural History), Geology. 102 BRUNTON AND MUNDY. :-, /' , '. f⬠1 â â -. â y --**,â *$ rJ [' ' ,- i. -<-v f\ 1 . ' â 1 â ^ 12b Figs 3-12 Argentiproductus margaritaceus (Phillips). Figs 3a-d, neotype (here selected), from Bishop's Quarry, Llandudno, north Wales, early Brigantian. Illustrated by Muir-Wood & Cooper (1960: pi. 123, figs 15, 16). Viewed dorsally, ventrally, posteriorly and laterally. 1. Figs 4a-c, posterior, lateral and ventral views of a ventral valve exterior from near Mold, north Wales, showing characteristic rib
. Bulletin of the British Museum (Natural History), Geology. 102 BRUNTON AND MUNDY. :-, /' , '. f⬠1 â â -. â y --**,â *$ rJ [' ' ,- i. -<-v f\ 1 . ' â 1 â ^ 12b Figs 3-12 Argentiproductus margaritaceus (Phillips). Figs 3a-d, neotype (here selected), from Bishop's Quarry, Llandudno, north Wales, early Brigantian. Illustrated by Muir-Wood & Cooper (1960: pi. 123, figs 15, 16). Viewed dorsally, ventrally, posteriorly and laterally. 1. Figs 4a-c, posterior, lateral and ventral views of a ventral valve exterior from near Mold, north Wales, showing characteristic ribbing and the paired flank spines. BB58627. Xl-5. Fig. 5, a dorsal valve interior from the same locality. BB58630. Xl-5. Fig. 6, a ventral valve interior from the same locality, showing the lateral ridge (arrowed). BB58629. X2. Figs 7a-b, an incomplete shell with part of the ventral valve missing, showing the shallow body cavity (arrowed) and the lamellose nature of the dorsal valve exterior (arrowed). Stebden Hill. BD1643. Xl-5. Figs 8a-b, ventral valve exterior showing, at the exfoliated umbo, the internal mould of the ventral adductor muscle scars (arrowed), and the principal spine positions (arrowed). Stebden Hill. BD1645. XI. Fig. 9, a ventral valve exterior showing growth deformation and spine bases (arrow); the shell damage results in a somewhat less inflated umbo than is typical for the species. This is a rare example from the framework facies. BD1634. Xl-5. Fig. 10, a shell from near Mold, north Wales, with one ear missing and showing the ventral lateral ridge fitting against the slight dorsal lateral ridge (arrowed). BB58628. X5. Figs lla-c, an example of the large form, viewed laterally, ventrally and posteriorly, from Parkhouse Hill, Derbyshire. B53583. XI. Figs 12a, b, ventral and posterolateral views of a large specimen showing the somewhat lamellose nature of the valve surface and spine bases (arrowed). Caldbeck, Cumberland [Cumbria]. Natural History Museu
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