. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA /,* m -'â¢m Fig. 101 Goniocladia cellulifera (Etheridge, 1873b). Line drawing of external features of BMNH PD9704; scale bar = 1 Fig. 102 Goniocladia cellulifera (Etheridge, 1873b). Line drawing of protion of a reticulate colony of BELUM K2164; scale bar = 1 mm. examined measured 19 x 12mm. Branches are bifoliate, laterally iFlattened, straight, and maintain a constant width along their length jxcept prior to division when a small increase in width occurs. Branches divide, at angles of 30° to 70°, at s
. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA /,* m -'â¢m Fig. 101 Goniocladia cellulifera (Etheridge, 1873b). Line drawing of external features of BMNH PD9704; scale bar = 1 Fig. 102 Goniocladia cellulifera (Etheridge, 1873b). Line drawing of protion of a reticulate colony of BELUM K2164; scale bar = 1 mm. examined measured 19 x 12mm. Branches are bifoliate, laterally iFlattened, straight, and maintain a constant width along their length jxcept prior to division when a small increase in width occurs. Branches divide, at angles of 30° to 70°, at short regular intervals. Coalescing of branches produces a regular pattern of pentagonal, lexagonal, or polygonal fenestrules upto long by >vide. Branch division frequently produces three branches 60° apart, pissipiments are absent. Branch cross-sections are narrow with a pyriform to rhombic outline. The barren reverse surface is well rounded with a faint to iistinct longitudinal carina while the celluliferous frontal surface is livided by a strong narrow angular median ridges are the â xtemal manifestations of the internal median wall. Autozooecial apertures are arranged in quincunx in four to seven ongitudinal rows, either side of the median ridge. Autozooecial ipertures are large, circular to rarely oval in shape. Proximal lunaria ire developed around most apertures. The size and thickness of the unaria decreases towards the median keel. Interapertural areas are !mooth and featureless. Autozooecial apertures are regularly spaced !vithin longitudinal rows. Interapertural spacing decreases towards !he median keel from five to two diameters apart (Table 31 and Fig. 03). 161 Colonies arise from stout holdfasts up to 13mm in width. Initial colony growth is encrusting where autozooecial apertures are large, circular in shape and closely spaced. From this adnate portion three to six erect branches arise, which either remain isolated as erect escha
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