. Bulletin of the British Museum (Natural History) Geology Supplement. ^. Fig. 13. Hystrichosphaeridium tubiferum (Ehrenberg). A specimen from the London Clay. Left, apical view showing the archaeopyle, precingular and cingular processes, and a single sulcal process ; right, antapical view (by transparency) showing the pre- cingular, sulcal, posterior intercalary and antapical processes. x c. 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 resem
. Bulletin of the British Museum (Natural History) Geology Supplement. ^. Fig. 13. Hystrichosphaeridium tubiferum (Ehrenberg). A specimen from the London Clay. Left, apical view showing the archaeopyle, precingular and cingular processes, and a single sulcal process ; right, antapical view (by transparency) showing the pre- cingular, sulcal, posterior intercalary and antapical processes. x c. 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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