. Bulletin of the Natural Histort Museum. Geology series. 132 and the Arnsbergian of Northamptonshire (Vine 1887) and Lanca- shire (Vine 1885), and the Pendleian of Yorkshire (Bancroft 1984, Vine 1881). Rhombopora hexagona sp. nov. Figs 26-31 HOLOTYPE. BMNH PD9535, Upper part of the Glencar Lime- stone (Visean, Asbian), Carrick Lough, County Fermanagh. Paratypes. BMNH PD9536-9564; , 34121, 34154, 34170, 42591a, 42592c, 42602a; BELUM K2186, from the same locality and horizon as above; , near base of Michelinia Beds, Hook Head Formation (Courceyan), Locality 8 (of Dresser
. Bulletin of the Natural Histort Museum. Geology series. 132 and the Arnsbergian of Northamptonshire (Vine 1887) and Lanca- shire (Vine 1885), and the Pendleian of Yorkshire (Bancroft 1984, Vine 1881). Rhombopora hexagona sp. nov. Figs 26-31 HOLOTYPE. BMNH PD9535, Upper part of the Glencar Lime- stone (Visean, Asbian), Carrick Lough, County Fermanagh. Paratypes. BMNH PD9536-9564; , 34121, 34154, 34170, 42591a, 42592c, 42602a; BELUM K2186, from the same locality and horizon as above; , near base of Michelinia Beds, Hook Head Formation (Courceyan), Locality 8 (of Dresser 1960), Lyraun Cove, Hook Head, County Wexford; , Michelinia Beds, Hook Head Formation (Courceyan), Locality 15 (of Dresser 1960), Brecaun Church, Hook Head, County Wexford; , Michelinia Beds, Hook Head Formation (Courceyan), Locality 40 (of Dresser 1960), Patrick's Bay, Hook Head, County Wexford; , Linopwductus Beds, Hook Head Formation (Courceyan), Locality 92 (of Dresser 1960), Hook Head, County Wexford. Derivation of trivial name. From the hexagonal pattern of heterostyles disposed around autozooecial apertures. Diagnosis. Rhombopora with thin dichotomising cylindrical branches. Autozooecia are budded from a central linear axis in a spiral manner. Hemisepta are common: a robust inferior hemiseptum is present at the base of the vestibule while a thin superior hemiseptum is found on distal chamber walls high in the endozone. Diaphragms are absent. Autozooecial apertures are oval in shape, vary in size around branches, and are arranged in intersecting oblique and longitudinal rows around the zoarium. Small heterostyles are ar- ranged on ridges between autozooecial chambers in an interlocking hexagonal pattern. Description. Zoaria are composed of thin cylindrical dichotomising branches that form delicate erect dendroid colonies. No complete colonies were observed: the largest fragment measured in length. Branching is infrequent and irregular wi
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