. Bulletin of the Natural Histort Museum. Geology series. . 17 18 15 16 Figs 13-18 Hyporosopora baltovensis sp. Oxfordian, Baltow. Poland. Scanning electron micrographs of uncoated. tubular specimens. 13. MUZ PIGij 1601AI/14, end view showing hollow cavity originally occupied by a cylindrical substrate, x 50. 14-15, MUZ PIG 1601/11/15: 14, wide distal fringe of basal lamina, x 38: 15, side view showing suture formed by anastomosis of opposite colony edges, x 23. 16, MUZ PIG 1601/11/16, x 28. 17, MUZ PIG 1601/11/17, X 20. 18, MUZ PIG 1601/11/18, x 12. inflated in height, lacking transvers
. Bulletin of the Natural Histort Museum. Geology series. . 17 18 15 16 Figs 13-18 Hyporosopora baltovensis sp. Oxfordian, Baltow. Poland. Scanning electron micrographs of uncoated. tubular specimens. 13. MUZ PIGij 1601AI/14, end view showing hollow cavity originally occupied by a cylindrical substrate, x 50. 14-15, MUZ PIG 1601/11/15: 14, wide distal fringe of basal lamina, x 38: 15, side view showing suture formed by anastomosis of opposite colony edges, x 23. 16, MUZ PIG 1601/11/16, x 28. 17, MUZ PIG 1601/11/17, X 20. 18, MUZ PIG 1601/11/18, x 12. inflated in height, lacking transverse ridges, indented by marginal autozooidal apertures. Floor of gonozooid pustulose, corrugated distally by the convexities of the underlying autozooids. Ooeciopore (Fig. 12) terminal, situated just beyond the inflated part of the gonozooid, small, transversely elongate, averaging mm long by mm wide, subcircular when the ooeciostome is preserved. Remarks. The main distinguishing feature of this new species i; the presence of transverse ridges crossing the colony surface. Transi versely ridged colonies also occur in four other Jurassic species: Plagioecia rugosa (d'Orbigny. 1853) from the Kimmeridgian of Li Rochelle (France) (Figs 21-22), Hyporosopora portlandica (Gregory 1896fl) from the Portlandian of southern England (revised by Tayloi. 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 Natural History Museum (London). Andover : Intercept
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