. Bulletin of the British Museum (Natural History). â .<?» .. Figs 57-59 Hyporosopora mantelli sp. nov. Fig. 57, BM(NH) 50781; 57A, x 17; 57B, growth margin with single tier of zooecial buds, x 65. Fig. 58, BM(NH) D55072; 58A, x 32; 583, autozooecial apertures, one with a terminal diaphragm, x 141. Fig. 59, USNM 69886a, holotype; 59A, gynozooecium, x 46; 59B, ooeciopore, x 200; see also Fig. 40. normally visible at the growing edge (Fig. 57B). The distal fringe of the basal lamina is not extensive. Zoarial surfaces arc fiat but may be crossed by irregular tra
. Bulletin of the British Museum (Natural History). â .<?» .. Figs 57-59 Hyporosopora mantelli sp. nov. Fig. 57, BM(NH) 50781; 57A, x 17; 57B, growth margin with single tier of zooecial buds, x 65. Fig. 58, BM(NH) D55072; 58A, x 32; 583, autozooecial apertures, one with a terminal diaphragm, x 141. Fig. 59, USNM 69886a, holotype; 59A, gynozooecium, x 46; 59B, ooeciopore, x 200; see also Fig. 40. normally visible at the growing edge (Fig. 57B). The distal fringe of the basal lamina is not extensive. Zoarial surfaces arc fiat but may be crossed by irregular transverse wrinkles of low amplitude (Fig. 58A). Colonics have a characteristically shiny appearance when viewed with an optical microscope. Autozooecia are immersed, small, slender, and have rounded, slightly dilated distal ends. Apertures are very small, circular or longitudinally elongate, widely spaced, and lack significant peristomes (Fig. 58B). Sparsely pseudoporous terminal diaphragms may occur. Pseudopores are subcircular and occur at a density of about 2000 per mm'. The ancestrula is overgrown by later zooecia. Gynozooecia are rare, their distal frontal walls are of low profile, subtriangular in outline (Figs 40, 59A), a little wider than long, with lateral lobes extending a little distal of the ooeciopore. The ooeciopore is transversely elongate (Fig. 59B).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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