. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA Stenophragmidium sp. 155 Figs 80—83 Table 27 Measurements of 5/e/i(>/)/ira,i;/»/W/;(H; sp. (in mm). N=6. Material. BELUM K3436, K15209-K15215 (5 zoarial frag- ments and 2 longitudinal sections). Upper part of the Glencar Limestone (Visean, Asbian), Sillees River, County Fermanagh. Description. Zoaria consist of large erect hollow expansions up to in width, or thin encrusting adnate sheets thick. Autozooecia are budded from a very thin undulating basal wall. Autozooecial chambers are rec
. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA Stenophragmidium sp. 155 Figs 80—83 Table 27 Measurements of 5/e/i(>/)/ira,i;/»/W/;(H; sp. (in mm). N=6. Material. BELUM K3436, K15209-K15215 (5 zoarial frag- ments and 2 longitudinal sections). Upper part of the Glencar Limestone (Visean, Asbian), Sillees River, County Fermanagh. Description. Zoaria consist of large erect hollow expansions up to in width, or thin encrusting adnate sheets thick. Autozooecia are budded from a very thin undulating basal wall. Autozooecial chambers are recumbent in the thin endozonal region ( mm) and straight in the wider exozone ( mm). The vestibule lies at a high angle of 80° to 85° to the zoarial surface, and is moderately wide ( mm). Autozooecial walls are mm thick in the endozone, but expand rapidly in the exozone to between and mm. They are usually of constant width, occasionally undulatory, and rarely moniliform. Walls consist of a well defined central hyaline zone ( mm wide) in which laminae are orientated parallel to the growth direction. Thin lateral laminae are derived from this central zone and bend sharply proximally. This is typical leioclemid-type wall structure (after Boardman 1960). Up to three hemiphragms are developed within and at the base of the exozone, where they arise from proximal walls. They are thin, often straight and occasionally bend slightly proximally. They are short ( mm in length), usually extend less than half-way into chambers, and have rounded bulbous tips. Autozooecial apertures are polygonal or irregular in shape, occa- isionally circular and are closely spaced at less than one diameter apart Apertures decrease in diameter away from monticules. Interapertural walls are rounded and moderately thick, with as many as 16 stylets occurring along their crests. Large acanthostyles ( mm) are usually found at autozooecial wall junctions
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