. Bulletin of the British Museum (Natural History). LOWER ORDOVICIAN BRACHIOPODA 19 characterized by grooves diverging from beak to bound posteromedian sector of about 20° and to extend anteriorly for about one-third of valve length; dorsal interior featureless. Figured material length width Internal and external parts of exfoliated BB 92286 1-5 14 BB 92287 1-5 1-4 Internal part of exfoliated BB 92272 2-1 1-8 Horizon and localities. BB 92286-9 from the calcareous upper part of Flags and Grits in the middle of Ffairfach Group, Ffairfach railway cutting (SN 628211); BB 92272 from the Lo
. Bulletin of the British Museum (Natural History). LOWER ORDOVICIAN BRACHIOPODA 19 characterized by grooves diverging from beak to bound posteromedian sector of about 20° and to extend anteriorly for about one-third of valve length; dorsal interior featureless. Figured material length width Internal and external parts of exfoliated BB 92286 1-5 14 BB 92287 1-5 1-4 Internal part of exfoliated BB 92272 2-1 1-8 Horizon and localities. BB 92286-9 from the calcareous upper part of Flags and Grits in the middle of Ffairfach Group, Ffairfach railway cutting (SN 628211); BB 92272 from the Lower Llandeilo Manolithus inflatus matunis Limestones exposed 100 m downstream from waterfall in Pontbren Araeth Dingle (SN 622237); SM from an unknown horizon and locality in the Llandeilo area. Discussion. Patenda from the Llandeilo area compares very closely with the type species P. bohemica Barrande from the Llanvim Sarka Formation of Czechoslovakia, as does the contemporaneous stock from the Shelve area of Shropshire (Williams 1974 : 40). The species is especially distinguishable in the full development of the limbus around the entire margin of the shell and the submarginal location of the dorsal beak. Although the Welsh forms have a less sharply truncated margin than the Shropshire specimens, the difference does not warrant any formal recognition. Paterula fissura [Addison MS] sp. nov. (Figs 42,46-49) Diagnosis. Elongately oval Patenda with submarginal beaks and deep, tapering pedicle notch from which radiate grooves on interior of pedicle valve enclosing a central circular muscle Figs 43-45 Pawnda cf bohemka Barrande. Figs 43a, b, BB 92272a, b. internal part of exfoliated brachial valve and latex cast of same, both x 16, from Lower Llandeilo limestones, Pontbren Araeth, Llandeilo. Figs 44a, b, BB 92287, internal and external parts of an exfoliated brachial valve, both x 12; Fig. 45, BB 92286, internal part of an exfoliated brachial valve x 16; all from the
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