. Bulletin of the British Museum (Natural History), Geology. . Fig. 21 (a) Lateral view of Acanthopleurella grindrodi, x 30; (b), (c) lateral view of A. stipulae, x 30, in relaxed attitude (b) and in 'active' feeding or grubbing attitude (c). Length of dorsal axial spines and anterior course of facial sutures 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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