. Bulletin of the British Museum (Natural History) Zoology. . Fig. 65 Ledella ultima: (a) Dorsal view of shell with thickened margin from Station Biogas V DS69; (b) Ventral view of specimens of similar size, one with and the other without a thickened margin, from the North America 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 Farn, Alexander E. London : Butterworths

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