. Bulletin of the British Museum (Natural History) Zoology. 160 J. A. ALLEN & F. J. HANNAH. Fig. 64 Ledella ultima: (a) & (b) Right lateral external view and internal view of right valve of the type specimen of L. bushae (note margin not thickened), (c) & (d) Right lateral external view and internal view of right valve of type of L. crassa (note margin thickened). See p. 161 & Fig. 73 for details of variation in shape. (Scale = 1 mm).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
. Bulletin of the British Museum (Natural History) Zoology. 160 J. A. ALLEN & F. J. HANNAH. Fig. 64 Ledella ultima: (a) & (b) Right lateral external view and internal view of right valve of the type specimen of L. bushae (note margin not thickened), (c) & (d) Right lateral external view and internal view of right valve of type of L. crassa (note margin thickened). See p. 161 & Fig. 73 for details of variation in shape. (Scale = 1 mm).. 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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