. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS HI. Figs 43-46 Plicatifera pseudoplicatilis (Muir-Wood). Four silicified specimens from the Asbian of Co. Fermanagh, Ireland. Fig. 43, a dorsal valve interior showing the lateral ridges and ear baffles (arrowed), adductor scars and faint brachial ridges. BB52835. XI-7. Fig. 44, an incomplete ventral valve interior showing lateral ridges (arrowed), adductor and diductor muscle fields. BB52834. X2. Fig. 45, incomplete articulated dorsal and ventral valves showing the deep adult body cavity and
. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS HI. Figs 43-46 Plicatifera pseudoplicatilis (Muir-Wood). Four silicified specimens from the Asbian of Co. Fermanagh, Ireland. Fig. 43, a dorsal valve interior showing the lateral ridges and ear baffles (arrowed), adductor scars and faint brachial ridges. BB52835. XI-7. Fig. 44, an incomplete ventral valve interior showing lateral ridges (arrowed), adductor and diductor muscle fields. BB52834. X2. Fig. 45, incomplete articulated dorsal and ventral valves showing the deep adult body cavity and the way in which the lateral ridges fit together. BB52837. XI-7. Figs 46a, b, a juvenile ventral valve viewed externally and internally, showing the initial clasping spines (arrowed), other juvenile spines and the pedicle sheath (arrowed). BB52840. X10. A. mesoloba occurs in western Europe, Poland and Russia (Moscow basin). Genus ADMODORUGOSUS nov. Diagnosis. Small to medium sized plicatiferinid with promi- nent concentric rugation covering both valves, but lacking radial ornament. Few scattered spines are confined to ventral valves. Body cavity is moderately shallow. Name. Latin, admodum = entirely, rugosus = wrinkled. Type species. Admodorugosus cracoensis nov. Discussion. Only the type species is recognized, and it is described below. Admodorugosus has been confused in the past most com- monly with Acanthoplecta Muir-Wood & Cooper or Pli- catifera Chao. When complete specimens are available those genera are differentiated by their smooth trails, the posterior ribbing of some Plicatifera species and the median spine- bearing ridge, within a sulcus, on Acanthoplecta. If only the posterior, visceral regions are available identification is less easy, but Admodorugosus is more rounded in both profile and outline than the other two genera. The rugation of the new genus is more comparable to that of Plicatifera than to that of Acanthoplecta, but adult Plicatifera specimens of t
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