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P.N. WYSE JACKSON 
Figs 94-100 Goniocladia cellulifera (Etheridge, 1873b); Upper part of the Glencar Limestone (Viséan, Asbian), Carrick Lough, County Fermanagh; 94, 
BMNH PD9719, colony fragment with typical branching pattern at a triple point, x9; 95, BMNH PD9704, laterally flattened branch with sharp median 
ridge on left and rounded carinal ridge on right; autozooecia are arranged in longitudinal rows with circular apertures: lunaria are indistinct; cystopores 
open to the surface and are seen as small circular ‘pits’ in interapertural areas, x50; 96, BMNH PD9718, close-up of branch with circular autozooecial 
apertures and small cystopore-openings, x45; 97, BELUM K2164, portion of reticulate colony. Branches divided perpendicular to the plane of the 
median wall; they coalesce to form large open rhombic, polygonal to irregularly-shaped fenestrules, x6; 98, BELUM K2163, robust holdfast of colony 
with portion of branch reticulation, x6; 99, BMNH PD9721; 99a, longitudinal section. Autozooecia diverge from a planar thin median wall at low angles; 
chambers are separated by vesicular tissue which consists of irregular to spherical vesicles, x20; 99b, transverse section; the carinal ridge is on the left 
hand side while the sharper median ridge forms a sharp keel on the right. Autozooecia are polygonal, squat, and the median wall is straight, x40; 100, 
BMNH PD9563, transverse section through a triple point reflected by the division of the median wall, x20. 
large pentagonal or polygonal fenestrules. In cross-section branches 
are pyriform. They are bisected by a compound median wall which 
protrudes as a faint carina on the rounded barren surface and as a 
strong keel on the obverse surface. 
Autozooecia are large, circular and arranged in quincunx in four 
to seven longitudinal rows either side of the median wall, from 
which they are budded. Low indistinct lunaria are frequently devel- 
oped around autozooecial apertures. Interapertural areas are smooth. 
Autozooecial chambers are narrow, recumbent, and closely packed 
in the endozone. They diverge away from adjacent chambers in the 
exozone, and vestibules are orientated at a high angle to the zoarial 
surface. Autozooecial chamber walls are thin. Basal diaphragms are 
rare. 
DESCRIPTION. Zoaria form large planar reticulate colonies of un- 
known maximum dimensions. The largest reticular fragment 
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