File:EB1911 - Cyclostomata - Fig. 2.—Median longitudinal section through anterior end of Petromyzon.jpg
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EB1911_-_Cyclostomata_-_Fig._2.—Median_longitudinal_section_through_anterior_end_of_Petromyzon.jpg (532 × 194 pixels, file size: 23 KB, MIME type: image/jpeg)