. Bulletin of the Natural Histort Museum. Geology series. 130 WYSE JACKSON. Figs 19-24 Rhombopora cylindrica sp. nov.: 19-23, Upper part of the Glencar Limestone (Visean, Asbian), Carrick Lough, County Fermanagh; 19, BMNH PD9509 (paratype). colony form showing long straight branches, with interconnected longitudinal and oblique rows of autozooecia, x20; 20, BMNH PD9507 (holotype); 20a. zoarial fragment with distal growing tip. showing regular arrangement of autozooecial apertures around branch; large acanthostyles are situated at the proximal and distal ends of apertures with smaller hete
. Bulletin of the Natural Histort Museum. Geology series. 130 WYSE JACKSON. Figs 19-24 Rhombopora cylindrica sp. nov.: 19-23, Upper part of the Glencar Limestone (Visean, Asbian), Carrick Lough, County Fermanagh; 19, BMNH PD9509 (paratype). colony form showing long straight branches, with interconnected longitudinal and oblique rows of autozooecia, x20; 20, BMNH PD9507 (holotype); 20a. zoarial fragment with distal growing tip. showing regular arrangement of autozooecial apertures around branch; large acanthostyles are situated at the proximal and distal ends of apertures with smaller heterostyles developed on surrounding walls, x20; 20b, detail of 20a showing autozooecial apertures and acanthostyles on interapertural walls, xl 10; 21, BMNH PD9534 (paratype), transverse section showing radial budding pattern of autozooecia and the differentiation of endozone and exozone; 22, BMNH PD9532 (paratype), tangential section showing oval-shaped autozooecia and heterostyles (C-type stylets) developed on interapertural walls, xlOO; 23, BMNH PD9531, (paratype). longitudinal section showing autozooecial chamber shape and the thickened exozonal walls, x40; 24; Shales above Main Limestone, Pendleian, Upper Carboniferous, Hurst, near Richmond, Yorkshire, ; 24a, longitudinal section, x25; 24b, detail of 24a showing morphology of acanthostyles, x80. at low angles of 10° to 25° and chambers are eight times as long as their maximum width. The chamber bends through 30° to 40° at the endozone/exozone boundary and vestibules are orientated at an angle of 45° to the zoarial surface. In cross-section chambers are rhombic, pentagonal or subcircular in shape. Chamber walls are thin ( mm), compound (a very thin granular core covered by laminated skeleton) in the endozone and thicker, with a predomi- nantly laminated skeleton, in the narrow exozone exozone varies in width between and mm and is approximately one fifth the width of branches. Thi
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