. Bulletin of the British Museum (Natural History) Zoology. Fig. 9 Ventral view of the heads in: a. Onychostoma sima b. Scaphesthes barbatulus c. Scaphesthes barbatus. 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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